CVE-2026-23269
HighSummary
W jądrze systemu Linux zidentyfikowano podatność w module AppArmor, która dotyczy walidacji stanów początkowych DFA w funkcji unpack_pdb. Stany początkowe są odczytywane z niezaufanych danych i mogą prowadzić do odczytu poza granicami tablic stanów DFA, co skutkuje błędem.
Risk Assessment
Wykorzystanie tej podatności może prowadzić do nieautoryzowanego dostępu do pamięci, co stwarza ryzyko dla integralności i poufności systemu. Może to również prowadzić do awarii aplikacji lub systemu.
Recommendation
Zaleca się odrzucenie polityk z nieprawidłowymi stanami początkowymi podczas rozpakowywania, aby zapobiec wystąpieniu tego problemu. Należy również zaktualizować jądro do najnowszej wersji, w której ta podatność została naprawiona.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: apparmor: validate DFA start states are in bounds in unpack_pdb Start states are read from untrusted data and used as indexes into the DFA state tables. The aa_dfa_next() function call in unpack_pdb() will access dfa->tables[YYTD_ID_BASE][start], and if the start state exceeds the number of states in the DFA, this results in an out-of-bound read. ================================================================== BUG: KASAN: slab-out-of-bounds in aa_dfa_next+0x2a1/0x360 Read of size 4 at addr ffff88811956fb90 by task su/1097 ... Reject policies with out-of-bounds start states during unpacking to prevent the issue.

