{"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":"2026-05-11T22:09:50.284Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:09:50.284Z"},"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"}}}}