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vuln-cve/data/2026/31xxx/CVE-2026-31495.json
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{
"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": "2026-11-10T12:44:37.122Z"
},
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"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."
}
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"include/uapi/linux/netfilter/nf_conntrack_common.h",
"net/netfilter/nf_conntrack_netlink.c",
"net/netfilter/nf_conntrack_proto_tcp.c"
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"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",
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},
{
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"status": "unaffected",
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{
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{
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{
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"status": "unaffected",
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{
"version": "6.19.11",
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
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"version": "7.0",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
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"nodes": [
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"negate": false,
"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
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"url": "https://git.kernel.org/stable/c/435b576cd2faa75154777868f8cbb73bf71644d3"
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{
"url": "https://git.kernel.org/stable/c/2ef71307c86a9f866d6e28f1a0c06e2e9d794474"
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{
"url": "https://git.kernel.org/stable/c/4f7d25f3f0786402ba48ff7d13b6241d77d975f5"
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{
"url": "https://git.kernel.org/stable/c/fcec5ce2d73a41668b24e3f18c803541602a59f6"
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"url": "https://git.kernel.org/stable/c/675c913b940488a84effdeeac5a1cfb657b59804"
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"url": "https://git.kernel.org/stable/c/c6cb41eaae875501eaaa487b8db6539feb092292"
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"url": "https://git.kernel.org/stable/c/45c33e79ae705b7af97e3117672b6cd258dd0b1b"
},
{
"url": "https://git.kernel.org/stable/c/8f15b5071b4548b0aafc03b366eb45c9c6566704"
}
],
"title": "netfilter: ctnetlink: use netlink policy range checks",
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