CVE-2024-26925: netfilter: nf_tables: release mutex after nft_gc_seq_end from abort path

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-04-25 · updated 2026-10-15
Weakness: CWE-667

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: release mutex after nft_gc_seq_end from abort path The commit mutex should not be released during the critical section between nft_gc_seq_begin() and nft_gc_seq_end(), otherwise, async GC worker could collect expired objects and get the released commit lock within the same GC sequence. nf_tables_module_autoload() temporarily releases the mutex to load module dependencies, then it goes back to replay the transaction again. Move it at the end of the abort phase after nft_gc_seq_end() is called.

Affected products

Debian Linux: 10.0
Linux kernel: from 4.19.316 before 4.20; from 5.4.262 before 5.4.274; from 5.10.198 before 5.10.215; from 5.15.134 before 5.15.155; from 6.1.56 before 6.1.86; from 6.4.13 before 6.5 — fixed in 4.20, 5.10.215, 5.15.155, 5.4.274, 6.1.86, 6.5

How to fix

Upgrade to a fixed version: Linux kernel 4.20, 5.10.215, 5.15.155, 5.4.274. Check the vendor advisory for mitigations.

References

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