CVE-2024-26673: netfilter: nft_ct: sanitize layer 3 and 4 protocol number in custom expectations

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-04-02 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_ct: sanitize layer 3 and 4 protocol number in custom expectations - Disallow families other than NFPROTO_{IPV4,IPV6,INET}. - Disallow layer 4 protocol with no ports, since destination port is a mandatory attribute for this object.

Affected products

Debian Linux: 10.0
Linux kernel: from 5.3 before 5.4.269; from 5.5 before 5.10.210; from 5.11 before 5.15.149; from 5.16 before 6.1.77; from 6.2 before 6.6.16; from 6.7 before 6.7.4 — fixed in 5.10.210, 5.15.149, 5.4.269, 6.1.77, 6.6.16, 6.7.4

How to fix

Upgrade to a fixed version: Linux kernel 5.10.210, 5.15.149, 5.4.269, 6.1.77. Check the vendor advisory for mitigations.

References

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