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

Affected: Linux, Siemens RUGGEDCOM RM1224 LTE(4G) EU, Siemens RUGGEDCOM RM1224 LTE(4G) NAM, Siemens SCALANCE M804PB, Siemens SCALANCE M812-1 ADSL-Router, Siemens SCALANCE M816-1 ADSL-Router, Siemens SCALANCE M826-2 SHDSL-Router, Siemens SCALANCE M874-2, Siemens SCALANCE M874-3, Siemens SCALANCE M874-3 3G-Router (CN) and 16 more

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.

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