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CVE-2025-71239: audit: add fchmodat2() to change attributes class

• 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: 2026-03-17 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: audit: add fchmodat2() to change attributes class fchmodat2(), introduced in version 6.6 is currently not in the change attribute class of audit. Calling fchmodat2() to change a file attribute in the same fashion than chmod() or fchmodat() will bypass audit rules such as: -w /tmp/test -p rwa -k test_rwa The current patch adds fchmodat2() to the change attributes class.

Affected products

• Linux kernel: from 6.6 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.16; from 6.19 before 6.19.6 — fixed in 6.12.75, 6.18.16, 6.19.6, 6.6.128

How to fix

Upgrade to a fixed version: Linux kernel 6.12.75, 6.18.16, 6.19.6, 6.6.128. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3e762a03713e8c25ca0108c075d662c897fc0623
• https://git.kernel.org/stable/c/4f493a6079b588cf1f04ce5ed6cdad45ab0d53dc
• https://git.kernel.org/stable/c/4fed776ca86378da7dd743a7b648e20b025ba8ef
• https://git.kernel.org/stable/c/91e27bc79c3bca93c06bf5a471d47df9a35b3741
• https://git.kernel.org/stable/c/c4334c0d0e7d6f02ed93756fd4ba807e3d00c05f
• https://www.bencteux.fr/posts/missing_syscalls_audit/

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