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

• 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: 2026-06-24 · updated 2026-10-15

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.

Affected products

• Linux kernel: from 2.6.28 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33 — fixed in 5.10.258, 5.15.209, 6.1.175, 6.12.91, 6.18.33, 6.6.141

How to fix

Upgrade to a fixed version: Linux kernel 5.10.258, 5.15.209, 6.1.175, 6.12.91. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/14203f9edf944b3fb63faadd62f38452421ecdfc
• https://git.kernel.org/stable/c/689a91ff18d6448d94c1ab7c076fecdb2b668bef
• https://git.kernel.org/stable/c/76160e04440c9698b989dbd9492a7ec4f520c9ee
• https://git.kernel.org/stable/c/7eaf9c740f33230cb224dc265f3c69f8531ff57b
• https://git.kernel.org/stable/c/9a109751b297b0f2135495749ef5a18ba31ec7d4
• https://git.kernel.org/stable/c/b6fe26f86a1649f84e057f3f15605b08eda15497
• https://git.kernel.org/stable/c/cbeb259f31382de70a70a59ffd0e66f5e80d9818
• https://git.kernel.org/stable/c/fa88161ef56e29bdaa05cc89dbc4ee221e94bfe9
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html

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