{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31495", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.102Z", "datePublished": "2026-04-22T13:54:17.591Z", "dateUpdated": "2026-04-22T13:54:17.591Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-04-22T13:54:17.591Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ctnetlink: use netlink policy range checks\n\nReplace manual range and mask validations with netlink policy\nannotations in ctnetlink code paths, so that the netlink core rejects\ninvalid values early and can generate extack errors.\n\n- CTA_PROTOINFO_TCP_STATE: reject values > TCP_CONNTRACK_SYN_SENT2 at\n policy level, removing the manual >= TCP_CONNTRACK_MAX check.\n- CTA_PROTOINFO_TCP_WSCALE_ORIGINAL/REPLY: reject values > TCP_MAX_WSCALE\n (14). The normal TCP option parsing path already clamps to this value,\n but the ctnetlink path accepted 0-255, causing undefined behavior when\n used as a u32 shift count.\n- CTA_FILTER_ORIG_FLAGS/REPLY_FLAGS: use NLA_POLICY_MASK with\n CTA_FILTER_F_ALL, removing the manual mask checks.\n- CTA_EXPECT_FLAGS: use NLA_POLICY_MASK with NF_CT_EXPECT_MASK, adding\n a new mask define grouping all valid expect flags.\n\nExtracted from a broader nf-next patch by Florian Westphal, scoped to\nctnetlink for the fixes tree."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/uapi/linux/netfilter/nf_conntrack_common.h", "net/netfilter/nf_conntrack_netlink.c", "net/netfilter/nf_conntrack_proto_tcp.c"], "versions": [{"version": "c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4", "lessThan": "435b576cd2faa75154777868f8cbb73bf71644d3", "status": "affected", "versionType": "git"}, {"version": "c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4", "lessThan": "2ef71307c86a9f866d6e28f1a0c06e2e9d794474", "status": "affected", "versionType": "git"}, {"version": "c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4", "lessThan": "4f7d25f3f0786402ba48ff7d13b6241d77d975f5", "status": "affected", "versionType": "git"}, {"version": "c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4", "lessThan": "fcec5ce2d73a41668b24e3f18c803541602a59f6", "status": "affected", "versionType": "git"}, {"version": "c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4", "lessThan": "675c913b940488a84effdeeac5a1cfb657b59804", "status": "affected", "versionType": "git"}, {"version": "c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4", "lessThan": "c6cb41eaae875501eaaa487b8db6539feb092292", "status": "affected", "versionType": "git"}, {"version": "c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4", "lessThan": "45c33e79ae705b7af97e3117672b6cd258dd0b1b", "status": "affected", "versionType": "git"}, {"version": "c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4", "lessThan": "8f15b5071b4548b0aafc03b366eb45c9c6566704", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/uapi/linux/netfilter/nf_conntrack_common.h", "net/netfilter/nf_conntrack_netlink.c", "net/netfilter/nf_conntrack_proto_tcp.c"], "versions": [{"version": "2.6.22", "status": "affected"}, {"version": "0", "lessThan": "2.6.22", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.131", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.80", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.21", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.11", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "2.6.22", "versionEndExcluding": "5.10.253"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.1.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.6.131"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.12.80"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.18.21"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.19.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/435b576cd2faa75154777868f8cbb73bf71644d3"}, {"url": "https://git.kernel.org/stable/c/2ef71307c86a9f866d6e28f1a0c06e2e9d794474"}, {"url": "https://git.kernel.org/stable/c/4f7d25f3f0786402ba48ff7d13b6241d77d975f5"}, {"url": "https://git.kernel.org/stable/c/fcec5ce2d73a41668b24e3f18c803541602a59f6"}, {"url": "https://git.kernel.org/stable/c/675c913b940488a84effdeeac5a1cfb657b59804"}, {"url": "https://git.kernel.org/stable/c/c6cb41eaae875501eaaa487b8db6539feb092292"}, {"url": "https://git.kernel.org/stable/c/45c33e79ae705b7af97e3117672b6cd258dd0b1b"}, {"url": "https://git.kernel.org/stable/c/8f15b5071b4548b0aafc03b366eb45c9c6566704"}], "title": "netfilter: ctnetlink: use netlink policy range checks", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ctnetlink: use netlink policy range checks\n\nReplace manual range and mask validations with netlink policy\nannotations in ctnetlink code paths, so that the netlink core rejects\ninvalid values early and can generate extack errors.\n\n- CTA_PROTOINFO_TCP_STATE: reject values > TCP_CONNTRACK_SYN_SENT2 at\n policy level, removing the manual >= TCP_CONNTRACK_MAX check.\n- CTA_PROTOINFO_TCP_WSCALE_ORIGINAL/REPLY: reject values > TCP_MAX_WSCALE\n (14). The normal TCP option parsing path already clamps to this value,\n but the ctnetlink path accepted 0-255, causing undefined behavior when\n used as a u32 shift count.\n- CTA_FILTER_ORIG_FLAGS/REPLY_FLAGS: use NLA_POLICY_MASK with\n CTA_FILTER_F_ALL, removing the manual mask checks.\n- CTA_EXPECT_FLAGS: use NLA_POLICY_MASK with NF_CT_EXPECT_MASK, adding\n a new mask define grouping all valid expect flags.\n\nExtracted from a broader nf-next patch by Florian Westphal, scoped to\nctnetlink for the fixes tree."}], "id": "CVE-2026-31495", "lastModified": "2026-04-22T14:16:47.500", "metrics": {}, "published": "2026-04-22T14:16:47.500", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2ef71307c86a9f866d6e28f1a0c06e2e9d794474"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/435b576cd2faa75154777868f8cbb73bf71644d3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/45c33e79ae705b7af97e3117672b6cd258dd0b1b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4f7d25f3f0786402ba48ff7d13b6241d77d975f5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/675c913b940488a84effdeeac5a1cfb657b59804"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8f15b5071b4548b0aafc03b366eb45c9c6566704"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c6cb41eaae875501eaaa487b8db6539feb092292"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fcec5ce2d73a41668b24e3f18c803541602a59f6"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4,435b576cd2faa75154777868f8cbb73bf71644d3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4,2ef71307c86a9f866d6e28f1a0c06e2e9d794474)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4,4f7d25f3f0786402ba48ff7d13b6241d77d975f5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4,fcec5ce2d73a41668b24e3f18c803541602a59f6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4,675c913b940488a84effdeeac5a1cfb657b59804)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4,c6cb41eaae875501eaaa487b8db6539feb092292)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4,45c33e79ae705b7af97e3117672b6cd258dd0b1b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4,8f15b5071b4548b0aafc03b366eb45c9c6566704)"}}], "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": "semver", "value": "2.6.22"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.22)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.10.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.19.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "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": "2026-04-22T18:00:05.277909+00:00", "updated": "2026-04-22T18:00:05.278006+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}