What’s Vulnerable › Vulnerabilities

CVE-2026-31416: netfilter: nfnetlink_log: account for netlink header size

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-13 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_log: account for netlink header size This is a followup to an old bug fix: NLMSG_DONE needs to account for the netlink header size, not just the attribute size. This can result in a WARN splat + drop of the netlink message, but other than this there are no ill effects.

Affected products

• Linux kernel: from 3.10.61 before 3.11; from 3.12.34 before 3.13; from 3.14.25 before 3.15; from 3.18 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.168 — fixed in 3.11, 3.13, 3.15, 5.10.253, 5.15.203, 6.1.168

How to fix

Upgrade to a fixed version: Linux kernel 3.11, 3.13, 3.15, 5.10.253. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/09883bf257f4243ed5a1fd35078ec6f0d0f3696a
• https://git.kernel.org/stable/c/4ec216410fac9de83c99177a160ebb8d42fad075
• https://git.kernel.org/stable/c/607245c4dbb86d9a10dd8388da0fb82170a99b61
• https://git.kernel.org/stable/c/6b419700e459fbf707ca1543b7c1b57a60fedb73
• https://git.kernel.org/stable/c/6d52a4a0520a6696bdde51caa11f2d6821cd0c01
• https://git.kernel.org/stable/c/761b45c661af48da6a065868d59ab1e1f64fd9b6
• https://git.kernel.org/stable/c/88a8f56e6276f616baad4274c6b8e4683e26e520
• https://git.kernel.org/stable/c/f08ffa3e1c8e36b6131f69c5eb23700c28cbd262
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-082556.html
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html

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