CVE-2026-31702
HighCVSS 7.8Summary
W jądrze systemu Linux zidentyfikowano podatność polegającą na błędzie use-after-free w funkcji f2fs_compress_write_end_io(). Problem ten występuje w wyniku nieprawidłowego zarządzania licznikami stron, co prowadzi do zniszczenia pamięci, która jest nadal używana przez inne operacje.
Risk Assessment
Podatność ta może prowadzić do nieprzewidzianych awarii systemu lub naruszenia integralności danych, co stanowi poważne ryzyko dla stabilności i bezpieczeństwa systemu operacyjnego.
Recommendation
Zaleca się aktualizację jądra systemu Linux do najnowszej wersji, w której wprowadzono poprawki eliminujące tę podatność, aby zapewnić bezpieczeństwo i stabilność systemu.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix use-after-free of sbi in f2fs_compress_write_end_io() In f2fs_compress_write_end_io(), dec_page_count(sbi, type) can bring the F2FS_WB_CP_DATA counter to zero, unblocking f2fs_wait_on_all_pages() in f2fs_put_super() on a concurrent unmount CPU. The unmount path then proceeds to call f2fs_destroy_page_array_cache(sbi), which destroys sbi->page_array_slab via kmem_cache_destroy(), and eventually kfree(sbi). Meanwhile, the bio completion callback is still executing: when it reaches page_array_free(sbi, ...), it dereferences sbi->page_array_slab — a destroyed slab cache — to call kmem_cache_free(), causing a use-after-free. This is the same class of bug as CVE-2026-23234 (which fixed the equivalent race in f2fs_write_end_io() in data.c), but in the compressed writeback completion path that was not covered by that fix. Fix this by moving dec_page_count() to after page_array_free(), so that all sbi accesses complete before the counter decrement that can unblock unmount. For non-last folios (where atomic_dec_return on cic->pending_pages is nonzero), dec_page_count is called immediately before returning — page_array_free is not reached on this path, so there is no post-decrement sbi access. For the last folio, page_array_free runs while the F2FS_WB_CP_DATA counter is still nonzero (this folio has not yet decremented it), keeping sbi alive, and dec_page_count runs as the final operation.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS