CVE-2026-31495
netfilter: ctnetlink: use netlink policy range checks
In 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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4; < 435b576cd2faa75154777868f8cbb73bf71644d3 (affected, git) ≥ c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4; < 2ef71307c86a9f866d6e28f1a0c06e2e9d794474 (affected, git) ≥ c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4; < 4f7d25f3f0786402ba48ff7d13b6241d77d975f5 (affected, git) ≥ c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4; < fcec5ce2d73a41668b24e3f18c803541602a59f6 (affected, git) ≥ c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4; < 675c913b940488a84effdeeac5a1cfb657b59804 (affected, git) ≥ c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4; < c6cb41eaae875501eaaa487b8db6539feb092292 (affected, git) ≥ c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4; < 45c33e79ae705b7af97e3117672b6cd258dd0b1b (affected, git) ≥ c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4; < 8f15b5071b4548b0aafc03b366eb45c9c6566704 (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
2.6.22 (affected) ≥ 0; < 2.6.22 (unaffected, semver) ≥ 5.10.253; ≤ 5.10.* (unaffected, semver) ≥ 5.15.203; ≤ 5.15.* (unaffected, semver) ≥ 6.1.168; ≤ 6.1.* (unaffected, semver) ≥ 6.6.131; ≤ 6.6.* (unaffected, semver) ≥ 6.12.80; ≤ 6.12.* (unaffected, semver) ≥ 6.18.21; ≤ 6.18.* (unaffected, semver) ≥ 6.19.11; ≤ 6.19.* (unaffected, semver) ≥ 7.0; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Siemens |
≥ V3.1.6; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Siemens |
≥ V3.1.5; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Siemens |
≥ V3.1.6; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Siemens |
≥ V3.1.5; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Siemens |
≥ V3.1.6; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Siemens |
≥ V3.1.5; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/435b576cd2faa75154777868f8cbb73bf71644d3CNA: Linux
- https://git.kernel.org/stable/c/2ef71307c86a9f866d6e28f1a0c06e2e9d794474CNA: Linux
- https://git.kernel.org/stable/c/4f7d25f3f0786402ba48ff7d13b6241d77d975f5CNA: Linux
- https://git.kernel.org/stable/c/fcec5ce2d73a41668b24e3f18c803541602a59f6CNA: Linux
- https://git.kernel.org/stable/c/675c913b940488a84effdeeac5a1cfb657b59804CNA: Linux
- https://git.kernel.org/stable/c/c6cb41eaae875501eaaa487b8db6539feb092292CNA: Linux
- https://git.kernel.org/stable/c/45c33e79ae705b7af97e3117672b6cd258dd0b1bCNA: Linux
- https://git.kernel.org/stable/c/8f15b5071b4548b0aafc03b366eb45c9c6566704CNA: Linux
- https://cert-portal.siemens.com/productcert/html/ssa-082556.htmlADP: siemens-SADP
- https://cert-portal.siemens.com/productcert/html/ssa-019113.htmlADP: siemens-SADP
- https://cert-portal.siemens.com/productcert/html/ssa-457936.htmlADP: siemens-SADP
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