CVE-2026-31636
CriticalSummary
W jądrze Linuxa zidentyfikowano podatność w funkcji rxgk_verify_authenticator(), która może prowadzić do odczytu poza granicami bufora. Problem wynika z nieprawidłowego obliczenia limitu parsera, co pozwala na odczytanie danych z uszkodzonych autoryzatorów odpowiedzi.
Risk Assessment
Wykorzystanie tej podatności może prowadzić do nieautoryzowanego dostępu do pamięci, co stwarza ryzyko awarii systemu lub ujawnienia wrażliwych danych. Organizacje powinny być świadome potencjalnych zagrożeń związanych z bezpieczeństwem ich systemów.
Recommendation
Zaleca się aktualizację jądra Linux do najnowszej wersji, w której ta podatność została naprawiona. Dodatkowo, monitorowanie logów systemowych w celu wykrycia potencjalnych prób wykorzystania tej luki jest wskazane.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: rxrpc: fix RESPONSE authenticator parser OOB read rxgk_verify_authenticator() copies auth_len bytes into a temporary buffer and then passes p + auth_len as the parser limit to rxgk_do_verify_authenticator(). Since p is a __be32 *, that inflates the parser end pointer by a factor of four and lets malformed RESPONSE authenticators read past the kmalloc() buffer. Decoded from the original latest-net reproduction logs with scripts/decode_stacktrace.sh: BUG: KASAN: slab-out-of-bounds in rxgk_verify_response() Call Trace: dump_stack_lvl() [lib/dump_stack.c:123] print_report() [mm/kasan/report.c:379 mm/kasan/report.c:482] kasan_report() [mm/kasan/report.c:597] rxgk_verify_response() [net/rxrpc/rxgk.c:1103 net/rxrpc/rxgk.c:1167 net/rxrpc/rxgk.c:1274] rxrpc_process_connection() [net/rxrpc/conn_event.c:266 net/rxrpc/conn_event.c:364 net/rxrpc/conn_event.c:386] process_one_work() [kernel/workqueue.c:3281]
Vulnerability data from NVD (NIST) · CISA KEV · EPSS