netfilter: ctnetlink: use netlink policy range checks

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Summary

CVECVE-2026-31495
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 14:16:47 UTC
Updated2026-04-28 14:44:15 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: use netlink policy range checks Replace manual range and mask validations with netlink policy annotations in ctnetlink code paths, so that the netlink core rejects invalid values early and can generate extack errors. - CTA_PROTOINFO_TCP_STATE: reject values > TCP_CONNTRACK_SYN_SENT2 at policy level, removing the manual >= TCP_CONNTRACK_MAX check. - CTA_PROTOINFO_TCP_WSCALE_ORIGINAL/REPLY: reject values > TCP_MAX_WSCALE (14). The normal TCP option parsing path already clamps to this value, but the ctnetlink path accepted 0-255, causing undefined behavior when used as a u32 shift count. - CTA_FILTER_ORIG_FLAGS/REPLY_FLAGS: use NLA_POLICY_MASK with CTA_FILTER_F_ALL, removing the manual mask checks. - CTA_EXPECT_FLAGS: use NLA_POLICY_MASK with NF_CT_EXPECT_MASK, adding a new mask define grouping all valid expect flags. Extracted from a broader nf-next patch by Florian Westphal, scoped to ctnetlink for the fixes tree.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000280000 probability, percentile 0.079100000 (date 2026-04-26)

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4 435b576cd2faa75154777868f8cbb73bf71644d3 git Not specified
CNA Linux Linux affected c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4 2ef71307c86a9f866d6e28f1a0c06e2e9d794474 git Not specified
CNA Linux Linux affected c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4 4f7d25f3f0786402ba48ff7d13b6241d77d975f5 git Not specified
CNA Linux Linux affected c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4 fcec5ce2d73a41668b24e3f18c803541602a59f6 git Not specified
CNA Linux Linux affected c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4 675c913b940488a84effdeeac5a1cfb657b59804 git Not specified
CNA Linux Linux affected c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4 c6cb41eaae875501eaaa487b8db6539feb092292 git Not specified
CNA Linux Linux affected c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4 45c33e79ae705b7af97e3117672b6cd258dd0b1b git Not specified
CNA Linux Linux affected c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4 8f15b5071b4548b0aafc03b366eb45c9c6566704 git Not specified
CNA Linux Linux affected 2.6.22 Not specified
CNA Linux Linux unaffected 2.6.22 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.131 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.80 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.21 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4f7d25f3f0786402ba48ff7d13b6241d77d975f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c6cb41eaae875501eaaa487b8db6539feb092292 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/675c913b940488a84effdeeac5a1cfb657b59804 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fcec5ce2d73a41668b24e3f18c803541602a59f6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2ef71307c86a9f866d6e28f1a0c06e2e9d794474 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/45c33e79ae705b7af97e3117672b6cd258dd0b1b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/435b576cd2faa75154777868f8cbb73bf71644d3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8f15b5071b4548b0aafc03b366eb45c9c6566704 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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