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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-31495 Detail

Description

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/2ef71307c86a9f866d6e28f1a0c06e2e9d794474 kernel.org Patch 
https://git.kernel.org/stable/c/435b576cd2faa75154777868f8cbb73bf71644d3 kernel.org Patch 
https://git.kernel.org/stable/c/45c33e79ae705b7af97e3117672b6cd258dd0b1b kernel.org Patch 
https://git.kernel.org/stable/c/4f7d25f3f0786402ba48ff7d13b6241d77d975f5 kernel.org Patch 
https://git.kernel.org/stable/c/675c913b940488a84effdeeac5a1cfb657b59804 kernel.org Patch 
https://git.kernel.org/stable/c/8f15b5071b4548b0aafc03b366eb45c9c6566704 kernel.org Patch 
https://git.kernel.org/stable/c/c6cb41eaae875501eaaa487b8db6539feb092292 kernel.org Patch 
https://git.kernel.org/stable/c/fcec5ce2d73a41668b24e3f18c803541602a59f6 kernel.org Patch 

Weakness Enumeration

CWE-ID CWE Name Source
NVD-CWE-noinfo Insufficient Information cwe source acceptance level NIST  

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Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-31495
NVD Published Date:
04/22/2026
NVD Last Modified:
04/28/2026
Source:
kernel.org