{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64581", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.798Z", "datePublished": "2026-08-05T08:09:35.556Z", "dateUpdated": "2026-08-05T08:09:35.556Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:09:35.556Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: fix sk_dst_cache double-free in xfrm_user_policy()\n\nxfrm_user_policy() clears the socket dst cache with __sk_dst_reset(),\ni.e. the non-atomic __sk_dst_set(sk, NULL): it reads sk_dst_cache with\nrcu_dereference_protected(), stores NULL and dst_release()s the old dst.\nThat is only safe if no other thread modifies sk_dst_cache concurrently.\n\nFor a connected UDP socket that does not hold: the transmit fast path\n(udp_sendmsg -> sk_dst_check -> sk_dst_reset) resets the cache locklessly\nwith an atomic xchg(). A per-socket policy change racing a send can make\nboth sides observe the same old dst and each dst_release() it, dropping\nthe socket's single reference twice and freeing the xfrm_dst bundle while\nit is still referenced:\n\n BUG: KASAN: slab-use-after-free in dst_release\n Write of size 4 at addr ffff88801897b6c0 by task exploit/155\n Call Trace:\n ...\n dst_release (... ./include/linux/rcuref.h:109)\n xfrm_user_policy (./include/net/sock.h:2239 ./include/net/sock.h:2256 net/xfrm/xfrm_state.c:3053)\n do_ip_setsockopt (net/ipv4/ip_sockglue.c:1347)\n ip_setsockopt (net/ipv4/ip_sockglue.c:1417)\n do_sock_setsockopt (net/socket.c:2368)\n __sys_setsockopt (net/socket.c:2393)\n __x64_sys_setsockopt (net/socket.c:2396)\n do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n\nReachable by an unprivileged user via a user+network namespace.\n\nUse the atomic sk_dst_reset() so the cache is cleared and released with a\nsingle xchg(): whichever side wins releases the dst once, the other sees\nNULL and does nothing. Behaviour is otherwise unchanged."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/xfrm/xfrm_state.c"], "versions": [{"version": "2b06cdf3e688b98fcc9945873b5d42792bd4eee0", "lessThan": "96b678d08268b5f5c6fc99d4289d9b7e334fc683", "status": "affected", "versionType": "git"}, {"version": "2b06cdf3e688b98fcc9945873b5d42792bd4eee0", "lessThan": "c283e9ada7fcb7dd4b10592623086b2e6d2f9925", "status": "affected", "versionType": "git"}, {"version": "72f157be2f81910ae759bfe2e5c2256fc4625645", "status": "affected", "versionType": "git"}, {"version": "9e9fe58a92a46c6d154d2901735bf230d91b8507", "status": "affected", "versionType": "git"}, {"version": "adc1ec6cdc20d430aa01b86497220709b9149466", "status": "affected", "versionType": "git"}, {"version": "b54033eb1cfd77aba471269ddd804ed8d3e35dea", "status": "affected", "versionType": "git"}, {"version": "c9e82cb34c3c2ee895af01bc899c6ed0bc6eb04a", "status": "affected", "versionType": "git"}, {"version": "5eef9b51114fcc65651d671add52f267f91b9451", "status": "affected", "versionType": "git"}, {"version": "3.16.52", "lessThan": "3.17", "status": "affected", "versionType": "semver"}, {"version": "4.4.163", "lessThan": "4.5", "status": "affected", "versionType": "semver"}, {"version": "3.18.101", "lessThan": "3.19", "status": "affected", "versionType": "semver"}, {"version": "4.1.52", "lessThan": "4.2", "status": "affected", "versionType": "semver"}, {"version": "4.4.123", "lessThan": "4.5", "status": "affected", "versionType": "semver"}, {"version": "4.9.89", "lessThan": "4.10", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/xfrm/xfrm_state.c"], "versions": [{"version": "4.14", "status": "affected"}, {"version": "0", "lessThan": "4.14", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc4", "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": "4.14", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "7.2-rc4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16.52"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4.163"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18.101"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1.52"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4.123"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9.89"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/96b678d08268b5f5c6fc99d4289d9b7e334fc683"}, {"url": "https://git.kernel.org/stable/c/c283e9ada7fcb7dd4b10592623086b2e6d2f9925"}], "title": "xfrm: fix sk_dst_cache double-free in xfrm_user_policy()", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2b06cdf3e688b98fcc9945873b5d42792bd4eee0,96b678d08268b5f5c6fc99d4289d9b7e334fc683)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2b06cdf3e688b98fcc9945873b5d42792bd4eee0,c283e9ada7fcb7dd4b10592623086b2e6d2f9925)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[72f157be2f81910ae759bfe2e5c2256fc4625645,*)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9e9fe58a92a46c6d154d2901735bf230d91b8507,*)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[adc1ec6cdc20d430aa01b86497220709b9149466,*)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b54033eb1cfd77aba471269ddd804ed8d3e35dea,*)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c9e82cb34c3c2ee895af01bc899c6ed0bc6eb04a,*)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5eef9b51114fcc65651d671add52f267f91b9451,*)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.16.52,3.17)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.4.163,4.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.18.101,3.19)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.1.52,4.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.4.123,4.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.9.89,4.10)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.14"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc4,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-05T09:45:06.959671+00:00", "updated": "2026-08-05T10:00:03.406931+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-415", "CWE-416"]}