CVE-2026-89492
CriticalExploitation Probability (EPSS)
Elevated risk50th percentile - higher than 50% of all known CVEs
Summary
W jądrze Linux w module ocfs2 wykryto lukę polegającą na braku walidacji liczby wpisów w indeksie katalogu podczas odczytu metadanych. Funkcje ocfs2_validate_dx_leaf() i ocfs2_validate_dx_root() nie sprawdzają, czy pola de_num_used i de_count mieszczą się w pojemności bloku, co pozwala spreparowanemu obrazowi dysku ustawić je na 0xffff i doprowadzić do odczytu poza granicami bloku metadanych 4KB. Luka jest osiągalna przy każdej operacji wyszukiwania ścieżki, stat() lub open() na zaindeksowanym katalogu po zamontowaniu obrazu.
Risk Assessment
Podatność umożliwia zdalnemu lub lokalnemu atakującemu z dostępem do spreparowanego obrazu systemu plików wywołanie odczytu poza granicami pamięci (slab out-of-bounds read), co może prowadzić do wycieku danych jądra lub awarii systemu (odmowa usługi). W środowiskach montujących niezaufane obrazy ocfs2 ryzyko jest wysokie.
Recommendation
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Vulnerability data from NVD (NIST) · CISA KEV · EPSS

