CVE-2026-31495

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-31495
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.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/2ef71307c86a9f866d6e28f1a0c06e2e9d794474 Patch
https://git.kernel.org/stable/c/435b576cd2faa75154777868f8cbb73bf71644d3 Patch
https://git.kernel.org/stable/c/45c33e79ae705b7af97e3117672b6cd258dd0b1b Patch
https://git.kernel.org/stable/c/4f7d25f3f0786402ba48ff7d13b6241d77d975f5 Patch
https://git.kernel.org/stable/c/675c913b940488a84effdeeac5a1cfb657b59804 Patch
https://git.kernel.org/stable/c/8f15b5071b4548b0aafc03b366eb45c9c6566704 Patch
https://git.kernel.org/stable/c/c6cb41eaae875501eaaa487b8db6539feb092292 Patch
https://git.kernel.org/stable/c/fcec5ce2d73a41668b24e3f18c803541602a59f6 Patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.22:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
History

14 Jul 2026, 13:18

Type Values Removed Values Added
References
  • () https://cert-portal.siemens.com/productcert/html/ssa-019113.html -
  • () https://cert-portal.siemens.com/productcert/html/ssa-082556.html -

28 Apr 2026, 14:44

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:2.6.22:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
References () https://git.kernel.org/stable/c/2ef71307c86a9f866d6e28f1a0c06e2e9d794474 - () https://git.kernel.org/stable/c/2ef71307c86a9f866d6e28f1a0c06e2e9d794474 - Patch
References () https://git.kernel.org/stable/c/435b576cd2faa75154777868f8cbb73bf71644d3 - () https://git.kernel.org/stable/c/435b576cd2faa75154777868f8cbb73bf71644d3 - Patch
References () https://git.kernel.org/stable/c/45c33e79ae705b7af97e3117672b6cd258dd0b1b - () https://git.kernel.org/stable/c/45c33e79ae705b7af97e3117672b6cd258dd0b1b - Patch
References () https://git.kernel.org/stable/c/4f7d25f3f0786402ba48ff7d13b6241d77d975f5 - () https://git.kernel.org/stable/c/4f7d25f3f0786402ba48ff7d13b6241d77d975f5 - Patch
References () https://git.kernel.org/stable/c/675c913b940488a84effdeeac5a1cfb657b59804 - () https://git.kernel.org/stable/c/675c913b940488a84effdeeac5a1cfb657b59804 - Patch
References () https://git.kernel.org/stable/c/8f15b5071b4548b0aafc03b366eb45c9c6566704 - () https://git.kernel.org/stable/c/8f15b5071b4548b0aafc03b366eb45c9c6566704 - Patch
References () https://git.kernel.org/stable/c/c6cb41eaae875501eaaa487b8db6539feb092292 - () https://git.kernel.org/stable/c/c6cb41eaae875501eaaa487b8db6539feb092292 - Patch
References () https://git.kernel.org/stable/c/fcec5ce2d73a41668b24e3f18c803541602a59f6 - () https://git.kernel.org/stable/c/fcec5ce2d73a41668b24e3f18c803541602a59f6 - Patch
First Time Linux
Linux linux Kernel
CWE NVD-CWE-noinfo

22 Apr 2026, 14:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-04-22 14:16

Updated : 2026-07-14 13:18

NVD link : CVE-2026-31495

Mitre link : CVE-2026-31495

CVE.ORG link : CVE-2026-31495

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo