{"dataType": "CVE_RECORD", "cveMetadata": {"cveId": "CVE-2024-37356", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-06-21T10:13:16.306Z", "datePublished": "2024-06-21T10:18:11.642Z", "dateUpdated": "2026-05-12T11:54:30.036Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:18:28.367Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: Fix shift-out-of-bounds in dctcp_update_alpha().\n\nIn dctcp_update_alpha(), we use a module parameter dctcp_shift_g\nas follows:\n\n alpha -= min_not_zero(alpha, alpha >> dctcp_shift_g);\n ...\n delivered_ce <<= (10 - dctcp_shift_g);\n\nIt seems syzkaller started fuzzing module parameters and triggered\nshift-out-of-bounds [0] by setting 100 to dctcp_shift_g:\n\n memcpy((void*)0x20000080,\n \"/sys/module/tcp_dctcp/parameters/dctcp_shift_g\\000\", 47);\n res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000080ul,\n /*flags=*/2ul, /*mode=*/0ul);\n memcpy((void*)0x20000000, \"100\\000\", 4);\n syscall(__NR_write, /*fd=*/r[0], /*val=*/0x20000000ul, /*len=*/4ul);\n\nLet's limit the max value of dctcp_shift_g by param_set_uint_minmax().\n\nWith this patch:\n\n # echo 10 > /sys/module/tcp_dctcp/parameters/dctcp_shift_g\n # cat /sys/module/tcp_dctcp/parameters/dctcp_shift_g\n 10\n # echo 11 > /sys/module/tcp_dctcp/parameters/dctcp_shift_g\n -bash: echo: write error: Invalid argument\n\n[0]:\nUBSAN: shift-out-of-bounds in net/ipv4/tcp_dctcp.c:143:12\nshift exponent 100 is too large for 32-bit type 'u32' (aka 'unsigned int')\nCPU: 0 PID: 8083 Comm: syz-executor345 Not tainted 6.9.0-05151-g1b294a1f3561 #2\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n1.13.0-1ubuntu1.1 04/01/2014\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x201/0x300 lib/dump_stack.c:114\n ubsan_epilogue lib/ubsan.c:231 [inline]\n __ubsan_handle_shift_out_of_bounds+0x346/0x3a0 lib/ubsan.c:468\n dctcp_update_alpha+0x540/0x570 net/ipv4/tcp_dctcp.c:143\n tcp_in_ack_event net/ipv4/tcp_input.c:3802 [inline]\n tcp_ack+0x17b1/0x3bc0 net/ipv4/tcp_input.c:3948\n tcp_rcv_state_process+0x57a/0x2290 net/ipv4/tcp_input.c:6711\n tcp_v4_do_rcv+0x764/0xc40 net/ipv4/tcp_ipv4.c:1937\n sk_backlog_rcv include/net/sock.h:1106 [inline]\n __release_sock+0x20f/0x350 net/core/sock.c:2983\n release_sock+0x61/0x1f0 net/core/sock.c:3549\n mptcp_subflow_shutdown+0x3d0/0x620 net/mptcp/protocol.c:2907\n mptcp_check_send_data_fin+0x225/0x410 net/mptcp/protocol.c:2976\n __mptcp_close+0x238/0xad0 net/mptcp/protocol.c:3072\n mptcp_close+0x2a/0x1a0 net/mptcp/protocol.c:3127\n inet_release+0x190/0x1f0 net/ipv4/af_inet.c:437\n __sock_release net/socket.c:659 [inline]\n sock_close+0xc0/0x240 net/socket.c:1421\n __fput+0x41b/0x890 fs/file_table.c:422\n task_work_run+0x23b/0x300 kernel/task_work.c:180\n exit_task_work include/linux/task_work.h:38 [inline]\n do_exit+0x9c8/0x2540 kernel/exit.c:878\n do_group_exit+0x201/0x2b0 kernel/exit.c:1027\n __do_sys_exit_group kernel/exit.c:1038 [inline]\n __se_sys_exit_group kernel/exit.c:1036 [inline]\n __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1036\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xe4/0x240 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x67/0x6f\nRIP: 0033:0x7f6c2b5005b6\nCode: Unable to access opcode bytes at 0x7f6c2b50058c.\nRSP: 002b:00007ffe883eb948 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7\nRAX: ffffffffffffffda RBX: 00007f6c2b5862f0 RCX: 00007f6c2b5005b6\nRDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001\nRBP: 0000000000000001 R08: 00000000000000e7 R09: ffffffffffffffc0\nR10: 0000000000000006 R11: 0000000000000246 R12: 00007f6c2b5862f0\nR13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001\n </TASK>"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/tcp_dctcp.c"], "versions": [{"version": "e3118e8359bb7c59555aca60c725106e6d78c5ce", "lessThan": "06d0fe049b51b0a92a70df8333fd85c4ba3eb2c6", "status": "affected", "versionType": "git"}, {"version": "e3118e8359bb7c59555aca60c725106e6d78c5ce", "lessThan": "6aacaa80d962f4916ccf90e2080306cec6c90fcf", "status": "affected", "versionType": "git"}, {"version": "e3118e8359bb7c59555aca60c725106e6d78c5ce", "lessThan": "e9b2f60636d18dfd0dd4965b3316f88dfd6a2b31", "status": "affected", "versionType": "git"}, {"version": "e3118e8359bb7c59555aca60c725106e6d78c5ce", "lessThan": "8602150286a2a860a1dc55cbd04f99316f19b40a", "status": "affected", "versionType": "git"}, {"version": "e3118e8359bb7c59555aca60c725106e6d78c5ce", "lessThan": "e65d13ec00a738fa7661925fd5929ab3c765d4be", "status": "affected", "versionType": "git"}, {"version": "e3118e8359bb7c59555aca60c725106e6d78c5ce", "lessThan": "02261d3f9dc7d1d7be7d778f839e3404ab99034c", "status": "affected", "versionType": "git"}, {"version": "e3118e8359bb7c59555aca60c725106e6d78c5ce", "lessThan": "237340dee373b97833a491d2e99fcf1d4a9adafd", "status": "affected", "versionType": "git"}, {"version": "e3118e8359bb7c59555aca60c725106e6d78c5ce", "lessThan": "3ebc46ca8675de6378e3f8f40768e180bb8afa66", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/tcp_dctcp.c"], "versions": [{"version": "3.18", "status": "affected"}, {"version": "0", "lessThan": "3.18", "status": "unaffected", "versionType": "semver"}, {"version": "4.19.316", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.278", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.219", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.161", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.93", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.33", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.9.4", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.10", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "4.19.316"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": 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"https://git.kernel.org/stable/c/06d0fe049b51b0a92a70df8333fd85c4ba3eb2c6"}, {"url": "https://git.kernel.org/stable/c/6aacaa80d962f4916ccf90e2080306cec6c90fcf"}, {"url": "https://git.kernel.org/stable/c/e9b2f60636d18dfd0dd4965b3316f88dfd6a2b31"}, {"url": "https://git.kernel.org/stable/c/8602150286a2a860a1dc55cbd04f99316f19b40a"}, {"url": "https://git.kernel.org/stable/c/e65d13ec00a738fa7661925fd5929ab3c765d4be"}, {"url": "https://git.kernel.org/stable/c/02261d3f9dc7d1d7be7d778f839e3404ab99034c"}, {"url": "https://git.kernel.org/stable/c/237340dee373b97833a491d2e99fcf1d4a9adafd"}, {"url": "https://git.kernel.org/stable/c/3ebc46ca8675de6378e3f8f40768e180bb8afa66"}], "title": "tcp: Fix shift-out-of-bounds in dctcp_update_alpha().", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-06-21T13:56:45.436880Z", "id": "CVE-2024-37356", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": 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{"url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-04T17:21:20.246Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-37356", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-06-21T13:56:45.436880Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-21T13:57:48.242Z"}}], "cna": {"title": "tcp: Fix shift-out-of-bounds in dctcp_update_alpha().", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "e3118e8359bb7c59555aca60c725106e6d78c5ce", "lessThan": 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"6.1.*"}, {"status": "unaffected", "version": "6.6.33", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.9.4", "versionType": "semver", "lessThanOrEqual": "6.9.*"}, {"status": "unaffected", "version": "6.10", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/ipv4/tcp_dctcp.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/06d0fe049b51b0a92a70df8333fd85c4ba3eb2c6"}, {"url": "https://git.kernel.org/stable/c/6aacaa80d962f4916ccf90e2080306cec6c90fcf"}, {"url": "https://git.kernel.org/stable/c/e9b2f60636d18dfd0dd4965b3316f88dfd6a2b31"}, {"url": "https://git.kernel.org/stable/c/8602150286a2a860a1dc55cbd04f99316f19b40a"}, {"url": "https://git.kernel.org/stable/c/e65d13ec00a738fa7661925fd5929ab3c765d4be"}, {"url": "https://git.kernel.org/stable/c/02261d3f9dc7d1d7be7d778f839e3404ab99034c"}, {"url": "https://git.kernel.org/stable/c/237340dee373b97833a491d2e99fcf1d4a9adafd"}, {"url": "https://git.kernel.org/stable/c/3ebc46ca8675de6378e3f8f40768e180bb8afa66"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: Fix shift-out-of-bounds in dctcp_update_alpha().\n\nIn dctcp_update_alpha(), we use a module parameter dctcp_shift_g\nas follows:\n\n alpha -= min_not_zero(alpha, alpha >> dctcp_shift_g);\n ...\n delivered_ce <<= (10 - dctcp_shift_g);\n\nIt seems syzkaller started fuzzing module parameters and triggered\nshift-out-of-bounds [0] by setting 100 to dctcp_shift_g:\n\n memcpy((void*)0x20000080,\n \"/sys/module/tcp_dctcp/parameters/dctcp_shift_g\\000\", 47);\n res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000080ul,\n /*flags=*/2ul, /*mode=*/0ul);\n memcpy((void*)0x20000000, \"100\\000\", 4);\n syscall(__NR_write, /*fd=*/r[0], /*val=*/0x20000000ul, /*len=*/4ul);\n\nLet's limit the max value of dctcp_shift_g by param_set_uint_minmax().\n\nWith this patch:\n\n # echo 10 > /sys/module/tcp_dctcp/parameters/dctcp_shift_g\n # cat /sys/module/tcp_dctcp/parameters/dctcp_shift_g\n 10\n # echo 11 > /sys/module/tcp_dctcp/parameters/dctcp_shift_g\n -bash: echo: write error: Invalid argument\n\n[0]:\nUBSAN: shift-out-of-bounds in net/ipv4/tcp_dctcp.c:143:12\nshift exponent 100 is too large for 32-bit type 'u32' (aka 'unsigned int')\nCPU: 0 PID: 8083 Comm: syz-executor345 Not tainted 6.9.0-05151-g1b294a1f3561 #2\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n1.13.0-1ubuntu1.1 04/01/2014\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x201/0x300 lib/dump_stack.c:114\n ubsan_epilogue lib/ubsan.c:231 [inline]\n __ubsan_handle_shift_out_of_bounds+0x346/0x3a0 lib/ubsan.c:468\n dctcp_update_alpha+0x540/0x570 net/ipv4/tcp_dctcp.c:143\n tcp_in_ack_event net/ipv4/tcp_input.c:3802 [inline]\n tcp_ack+0x17b1/0x3bc0 net/ipv4/tcp_input.c:3948\n tcp_rcv_state_process+0x57a/0x2290 net/ipv4/tcp_input.c:6711\n tcp_v4_do_rcv+0x764/0xc40 net/ipv4/tcp_ipv4.c:1937\n sk_backlog_rcv include/net/sock.h:1106 [inline]\n __release_sock+0x20f/0x350 net/core/sock.c:2983\n release_sock+0x61/0x1f0 net/core/sock.c:3549\n mptcp_subflow_shutdown+0x3d0/0x620 net/mptcp/protocol.c:2907\n mptcp_check_send_data_fin+0x225/0x410 net/mptcp/protocol.c:2976\n __mptcp_close+0x238/0xad0 net/mptcp/protocol.c:3072\n mptcp_close+0x2a/0x1a0 net/mptcp/protocol.c:3127\n inet_release+0x190/0x1f0 net/ipv4/af_inet.c:437\n __sock_release net/socket.c:659 [inline]\n sock_close+0xc0/0x240 net/socket.c:1421\n __fput+0x41b/0x890 fs/file_table.c:422\n task_work_run+0x23b/0x300 kernel/task_work.c:180\n exit_task_work include/linux/task_work.h:38 [inline]\n do_exit+0x9c8/0x2540 kernel/exit.c:878\n do_group_exit+0x201/0x2b0 kernel/exit.c:1027\n __do_sys_exit_group kernel/exit.c:1038 [inline]\n __se_sys_exit_group kernel/exit.c:1036 [inline]\n __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1036\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xe4/0x240 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x67/0x6f\nRIP: 0033:0x7f6c2b5005b6\nCode: Unable to access opcode bytes at 0x7f6c2b50058c.\nRSP: 002b:00007ffe883eb948 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7\nRAX: ffffffffffffffda RBX: 00007f6c2b5862f0 RCX: 00007f6c2b5005b6\nRDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001\nRBP: 0000000000000001 R08: 00000000000000e7 R09: ffffffffffffffc0\nR10: 0000000000000006 R11: 0000000000000246 R12: 00007f6c2b5862f0\nR13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001\n </TASK>"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.19.316", "versionStartIncluding": "3.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.278", "versionStartIncluding": "3.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.219", "versionStartIncluding": "3.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.161", "versionStartIncluding": "3.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.93", "versionStartIncluding": "3.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.33", "versionStartIncluding": "3.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.9.4", "versionStartIncluding": "3.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.10", "versionStartIncluding": "3.18"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T09:13:22.548Z"}}}, "cveMetadata": {"cveId": "CVE-2024-37356", "state": "PUBLISHED", "dateUpdated": "2025-11-04T17:21:20.246Z", "dateReserved": "2024-06-21T10:13:16.306Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-06-21T10:18:11.642Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "38710DA2-400D-4570-BDB2-C84CC12E69E3", "versionEndExcluding": "4.19.316", "versionStartIncluding": "3.18", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "7FDBF235-DA18-49A1-8690-6C7272FD0701", "versionEndExcluding": "5.4.278", "versionStartIncluding": "4.20", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E9063AF3-D593-43B7-810D-58B87F82F9F9", "versionEndExcluding": "5.10.219", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "31130639-53FE-4726-8986-434EE2528CB2", "versionEndExcluding": "5.15.161", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "EEFB78EE-F990-4197-BF1C-156760A55667", "versionEndExcluding": "6.1.93", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "FCE796DF-3B50-4DC6-BAE5-95271068FC9E", "versionEndExcluding": "6.6.33", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "991B9791-966A-4D18-9E8D-A8AB128E5627", "versionEndExcluding": "6.9.4", "versionStartIncluding": "6.7", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: Fix shift-out-of-bounds in dctcp_update_alpha().\n\nIn dctcp_update_alpha(), we use a module parameter dctcp_shift_g\nas follows:\n\n alpha -= min_not_zero(alpha, alpha >> dctcp_shift_g);\n ...\n delivered_ce <<= (10 - dctcp_shift_g);\n\nIt seems syzkaller started fuzzing module parameters and triggered\nshift-out-of-bounds [0] by setting 100 to dctcp_shift_g:\n\n memcpy((void*)0x20000080,\n \"/sys/module/tcp_dctcp/parameters/dctcp_shift_g\\000\", 47);\n res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000080ul,\n /*flags=*/2ul, /*mode=*/0ul);\n memcpy((void*)0x20000000, \"100\\000\", 4);\n syscall(__NR_write, /*fd=*/r[0], /*val=*/0x20000000ul, /*len=*/4ul);\n\nLet's limit the max value of dctcp_shift_g by param_set_uint_minmax().\n\nWith this patch:\n\n # echo 10 > /sys/module/tcp_dctcp/parameters/dctcp_shift_g\n # cat /sys/module/tcp_dctcp/parameters/dctcp_shift_g\n 10\n # echo 11 > /sys/module/tcp_dctcp/parameters/dctcp_shift_g\n -bash: echo: write error: Invalid argument\n\n[0]:\nUBSAN: shift-out-of-bounds in net/ipv4/tcp_dctcp.c:143:12\nshift exponent 100 is too large for 32-bit type 'u32' (aka 'unsigned int')\nCPU: 0 PID: 8083 Comm: syz-executor345 Not tainted 6.9.0-05151-g1b294a1f3561 #2\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n1.13.0-1ubuntu1.1 04/01/2014\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x201/0x300 lib/dump_stack.c:114\n ubsan_epilogue lib/ubsan.c:231 [inline]\n __ubsan_handle_shift_out_of_bounds+0x346/0x3a0 lib/ubsan.c:468\n dctcp_update_alpha+0x540/0x570 net/ipv4/tcp_dctcp.c:143\n tcp_in_ack_event net/ipv4/tcp_input.c:3802 [inline]\n tcp_ack+0x17b1/0x3bc0 net/ipv4/tcp_input.c:3948\n tcp_rcv_state_process+0x57a/0x2290 net/ipv4/tcp_input.c:6711\n tcp_v4_do_rcv+0x764/0xc40 net/ipv4/tcp_ipv4.c:1937\n sk_backlog_rcv include/net/sock.h:1106 [inline]\n __release_sock+0x20f/0x350 net/core/sock.c:2983\n release_sock+0x61/0x1f0 net/core/sock.c:3549\n mptcp_subflow_shutdown+0x3d0/0x620 net/mptcp/protocol.c:2907\n mptcp_check_send_data_fin+0x225/0x410 net/mptcp/protocol.c:2976\n __mptcp_close+0x238/0xad0 net/mptcp/protocol.c:3072\n mptcp_close+0x2a/0x1a0 net/mptcp/protocol.c:3127\n inet_release+0x190/0x1f0 net/ipv4/af_inet.c:437\n __sock_release net/socket.c:659 [inline]\n sock_close+0xc0/0x240 net/socket.c:1421\n __fput+0x41b/0x890 fs/file_table.c:422\n task_work_run+0x23b/0x300 kernel/task_work.c:180\n exit_task_work include/linux/task_work.h:38 [inline]\n do_exit+0x9c8/0x2540 kernel/exit.c:878\n do_group_exit+0x201/0x2b0 kernel/exit.c:1027\n __do_sys_exit_group kernel/exit.c:1038 [inline]\n __se_sys_exit_group kernel/exit.c:1036 [inline]\n __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1036\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xe4/0x240 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x67/0x6f\nRIP: 0033:0x7f6c2b5005b6\nCode: Unable to access opcode bytes at 0x7f6c2b50058c.\nRSP: 002b:00007ffe883eb948 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7\nRAX: ffffffffffffffda RBX: 00007f6c2b5862f0 RCX: 00007f6c2b5005b6\nRDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001\nRBP: 0000000000000001 R08: 00000000000000e7 R09: ffffffffffffffc0\nR10: 0000000000000006 R11: 0000000000000246 R12: 00007f6c2b5862f0\nR13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001\n </TASK>"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tcp: corrige el desplazamiento fuera de los l\u00edmites en dctcp_update_alpha(). En dctcp_update_alpha(), utilizamos un par\u00e1metro de m\u00f3dulo dctcp_shift_g de la siguiente manera: alpha -= min_not_zero(alpha, alpha &gt;&gt; dctcp_shift_g); ... entregado_ce &lt;&lt;= (10 - dctcp_shift_g); Parece que syzkaller comenz\u00f3 a modificar los par\u00e1metros del m\u00f3dulo y activ\u00f3 el desplazamiento fuera de los l\u00edmites [0] estableciendo 100 en dctcp_shift_g: memcpy((void*)0x20000080, \"/sys/module/tcp_dctcp/parameters/dctcp_shift_g\\000\", 47) ; res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000080ul, /*flags=*/2ul, /*mode=*/0ul); memcpy((void*)0x20000000, \"100\\000\", 4); syscall(__NR_write, /*fd=*/r[0], /*val=*/0x20000000ul, /*len=*/4ul); Limitemos el valor m\u00e1ximo de dctcp_shift_g mediante param_set_uint_minmax(). Con este parche: # echo 10 &gt; /sys/module/tcp_dctcp/parameters/dctcp_shift_g # cat /sys/module/tcp_dctcp/parameters/dctcp_shift_g 10 # echo 11 &gt; /sys/module/tcp_dctcp/parameters/dctcp_shift_g -bash: echo: error de escritura: argumento no v\u00e1lido [0]: UBSAN: desplazamiento fuera de los l\u00edmites en net/ipv4/tcp_dctcp.c:143:12 el exponente de desplazamiento 100 es demasiado grande para el tipo 'u32' de 32 bits (tambi\u00e9n conocido como 'int sin signo' ) CPU: 0 PID: 8083 Comm: syz-executor345 No contaminado 6.9.0-05151-g1b294a1f3561 #2 Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 01/04/2014 Seguimiento de llamadas: __dump_stack lib/dump_stack.c:88 [en l\u00ednea] dump_stack_lvl+0x201/0x300 lib/dump_stack.c:114 ubsan_epilogue lib/ubsan.c:231 [en l\u00ednea] __ubsan_handle_shift_out_of_bounds+0x346/0x3a0 lib/ubsan.c :468 dctcp_update_alpha+0x540/0x570 net/ipv4/tcp_dctcp.c:143 tcp_in_ack_event net/ipv4/tcp_input.c:3802 [en l\u00ednea] tcp_ack+0x17b1/0x3bc0 net/ipv4/tcp_input.c:3948 v_state_process+0x57a/0x2290 neto/ ipv4/tcp_input.c:6711 tcp_v4_do_rcv+0x764/0xc40 net/ipv4/tcp_ipv4.c:1937 sk_backlog_rcv include/net/sock.h:1106 [en l\u00ednea] __release_sock+0x20f/0x350 net/core/sock.c:2983 release_sock+ 0x61/0x1f0 net/core/sock.c:3549 mptcp_subflow_shutdown+0x3d0/0x620 net/mptcp/protocol.c:2907 mptcp_check_send_data_fin+0x225/0x410 net/mptcp/protocol.c:2976 __mptcp_close+0x238/0x ad0 net/mptcp/protocolo .c:3072 mptcp_close+0x2a/0x1a0 net/mptcp/protocol.c:3127 inet_release+0x190/0x1f0 net/ipv4/af_inet.c:437 __sock_release net/socket.c:659 [en l\u00ednea] sock_close+0xc0/0x240 net/ socket.c:1421 __fput+0x41b/0x890 fs/file_table.c:422 task_work_run+0x23b/0x300 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [en l\u00ednea] do_exit+0x9c8/0x2540 kernel/exit .c:878 do_group_exit+0x201/0x2b0 kernel/exit.c:1027 __do_sys_exit_group kernel/exit.c:1038 [en l\u00ednea] __se_sys_exit_group kernel/exit.c:1036 [en l\u00ednea] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:10 36 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xe4/0x240 arch/x86/entry/common.c:83 Entry_SYSCALL_64_after_hwframe+0x67/0x6f RIP: 0033:0x7f6c2b5005b6 C\u00f3digo: no se puede acceder a los bytes del c\u00f3digo de operaci\u00f3n en 0x7f6c2b50058c . RSP: 002b:00007ffe883eb948 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f6c2b5862f0 RCX: 00007f6c2b5005b6 RDX: 0000000001 RSI: 000000000000003c RDI: 0000000000000001 RBP: 0000000000000001 R08: 00000000000000e7 R09: ffffffffffffffc0 R10: 06 R11: 0000000000000246 R12: 00007f6c2b5862f0 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 "}], "id": "CVE-2024-37356", "lastModified": "2026-05-12T12:16:51.453", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2024-06-21T11:15:10.677", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/02261d3f9dc7d1d7be7d778f839e3404ab99034c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/06d0fe049b51b0a92a70df8333fd85c4ba3eb2c6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/237340dee373b97833a491d2e99fcf1d4a9adafd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3ebc46ca8675de6378e3f8f40768e180bb8afa66"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6aacaa80d962f4916ccf90e2080306cec6c90fcf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8602150286a2a860a1dc55cbd04f99316f19b40a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e65d13ec00a738fa7661925fd5929ab3c765d4be"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e9b2f60636d18dfd0dd4965b3316f88dfd6a2b31"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/02261d3f9dc7d1d7be7d778f839e3404ab99034c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/06d0fe049b51b0a92a70df8333fd85c4ba3eb2c6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/237340dee373b97833a491d2e99fcf1d4a9adafd"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3ebc46ca8675de6378e3f8f40768e180bb8afa66"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6aacaa80d962f4916ccf90e2080306cec6c90fcf"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8602150286a2a860a1dc55cbd04f99316f19b40a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e65d13ec00a738fa7661925fd5929ab3c765d4be"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e9b2f60636d18dfd0dd4965b3316f88dfd6a2b31"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-398330.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-613116.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:7001", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-553.22.1.rt7.363.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-09-24T00:00:00Z"}, {"advisory": "RHSA-2024:7000", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-553.22.1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-09-24T00:00:00Z"}, {"advisory": "RHSA-2024:6206", "cpe": "cpe:/o:redhat:rhel_eus:8.8", "package": "kernel-0:4.18.0-477.70.1.el8_8", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2024-09-03T00:00:00Z"}, {"advisory": "RHSA-2024:5363", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-427.31.1.el9_4", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-08-15T00:00:00Z"}, {"advisory": "RHSA-2024:5363", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-427.31.1.el9_4", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-08-15T00:00:00Z"}, {"advisory": "RHSA-2024:10772", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "kernel-0:5.14.0-284.95.1.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-12-04T00:00:00Z"}, {"advisory": "RHSA-2024:10773", "cpe": "cpe:/a:redhat:rhel_eus:9.2::nfv", "package": "kernel-rt-0:5.14.0-284.95.1.rt14.380.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-12-04T00:00:00Z"}], "bugzilla": {"description": "kernel: tcp: Fix shift-out-of-bounds in dctcp_update_alpha().", "id": "2293658", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2293658"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.6", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H", "status": "verified"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntcp: Fix shift-out-of-bounds in dctcp_update_alpha().\nIn dctcp_update_alpha(), we use a module parameter dctcp_shift_g\nas follows:\nalpha -= min_not_zero(alpha, alpha >> dctcp_shift_g);\n...\ndelivered_ce <<= (10 - dctcp_shift_g);\nIt seems syzkaller started fuzzing module parameters and triggered\nshift-out-of-bounds [0] by setting 100 to dctcp_shift_g:\nmemcpy((void*)0x20000080,\n\"/sys/module/tcp_dctcp/parameters/dctcp_shift_g\\000\", 47);\nres = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000080ul,\n/*flags=*/2ul, /*mode=*/0ul);\nmemcpy((void*)0x20000000, \"100\\000\", 4);\nsyscall(__NR_write, /*fd=*/r[0], /*val=*/0x20000000ul, /*len=*/4ul);\nLet's limit the max value of dctcp_shift_g by param_set_uint_minmax().\nWith this patch:\n# echo 10 > /sys/module/tcp_dctcp/parameters/dctcp_shift_g\n# cat /sys/module/tcp_dctcp/parameters/dctcp_shift_g\n10\n# echo 11 > /sys/module/tcp_dctcp/parameters/dctcp_shift_g\n-bash: echo: write error: Invalid argument\n[0]:\nUBSAN: shift-out-of-bounds in net/ipv4/tcp_dctcp.c:143:12\nshift exponent 100 is too large for 32-bit type 'u32' (aka 'unsigned int')\nCPU: 0 PID: 8083 Comm: syz-executor345 Not tainted 6.9.0-05151-g1b294a1f3561 #2\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n1.13.0-1ubuntu1.1 04/01/2014\nCall Trace:\n<TASK>\n__dump_stack lib/dump_stack.c:88 [inline]\ndump_stack_lvl+0x201/0x300 lib/dump_stack.c:114\nubsan_epilogue lib/ubsan.c:231 [inline]\n__ubsan_handle_shift_out_of_bounds+0x346/0x3a0 lib/ubsan.c:468\ndctcp_update_alpha+0x540/0x570 net/ipv4/tcp_dctcp.c:143\ntcp_in_ack_event net/ipv4/tcp_input.c:3802 [inline]\ntcp_ack+0x17b1/0x3bc0 net/ipv4/tcp_input.c:3948\ntcp_rcv_state_process+0x57a/0x2290 net/ipv4/tcp_input.c:6711\ntcp_v4_do_rcv+0x764/0xc40 net/ipv4/tcp_ipv4.c:1937\nsk_backlog_rcv include/net/sock.h:1106 [inline]\n__release_sock+0x20f/0x350 net/core/sock.c:2983\nrelease_sock+0x61/0x1f0 net/core/sock.c:3549\nmptcp_subflow_shutdown+0x3d0/0x620 net/mptcp/protocol.c:2907\nmptcp_check_send_data_fin+0x225/0x410 net/mptcp/protocol.c:2976\n__mptcp_close+0x238/0xad0 net/mptcp/protocol.c:3072\nmptcp_close+0x2a/0x1a0 net/mptcp/protocol.c:3127\ninet_release+0x190/0x1f0 net/ipv4/af_inet.c:437\n__sock_release net/socket.c:659 [inline]\nsock_close+0xc0/0x240 net/socket.c:1421\n__fput+0x41b/0x890 fs/file_table.c:422\ntask_work_run+0x23b/0x300 kernel/task_work.c:180\nexit_task_work include/linux/task_work.h:38 [inline]\ndo_exit+0x9c8/0x2540 kernel/exit.c:878\ndo_group_exit+0x201/0x2b0 kernel/exit.c:1027\n__do_sys_exit_group kernel/exit.c:1038 [inline]\n__se_sys_exit_group kernel/exit.c:1036 [inline]\n__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1036\ndo_syscall_x64 arch/x86/entry/common.c:52 [inline]\ndo_syscall_64+0xe4/0x240 arch/x86/entry/common.c:83\nentry_SYSCALL_64_after_hwframe+0x67/0x6f\nRIP: 0033:0x7f6c2b5005b6\nCode: Unable to access opcode bytes at 0x7f6c2b50058c.\nRSP: 002b:00007ffe883eb948 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7\nRAX: ffffffffffffffda RBX: 00007f6c2b5862f0 RCX: 00007f6c2b5005b6\nRDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001\nRBP: 0000000000000001 R08: 00000000000000e7 R09: ffffffffffffffc0\nR10: 0000000000000006 R11: 0000000000000246 R12: 00007f6c2b5862f0\nR13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001\n</TASK>", "A security vulnerability has been identified in the TCP networking implementation of the Linux kernel. Specifically, the dctcp_update_alpha() function is susceptible to a shift-out-of-bounds condition. This flaw could potentially be exploited to cause unexpected behavior or a denial-of-service."], "name": "CVE-2024-37356", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-06-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-37356\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-37356\nhttps://lore.kernel.org/linux-cve-announce/2024062137-CVE-2024-37356-cc7b@gregkh/T"], "statement": "Within regulated environments, a combination of the following controls acts as a significant barrier to successfully exploiting this specific CWE-125: Out-of-bounds Read vulnerability, justifying a severity downgrade from Moderate to Low.\nThe use of baseline configurations, change control, and configuration settings within the platform enforces secure system configurations, patch management, and proper runtime settings, which helps prevent the introduction of memory handling issues through insecure defaults, unpatched components, and misconfigurations. Specifically, the use of process isolation and memory protection ensures memory integrity by isolating processes and enforcing memory protection mechanisms that limit an attacker's ability to exploit or read memory. System monitoring controls provide an additional layer of protection in the detection of anomalous behavior and unauthorized memory-related access.", "threat_severity": "Moderate"}

{}