CVE-2026-43075
HighCVSS 7.8Summary
W jądrze Linuxa zidentyfikowano podatność w systemie plików ocfs2, która prowadzi do zapisu poza przydzielonym obszarem pamięci w funkcji ocfs2_write_end_inline. Problem występuje podczas operacji kopiowania w przypadku uszkodzonego systemu plików ocfs2, co może prowadzić do nadpisania danych w sąsiednich obszarach pamięci.
Risk Assessment
Podatność ta może prowadzić do poważnych problemów z integralnością danych na uszkodzonym systemie plików, co zagraża stabilności i bezpieczeństwu systemu. Atakujący mogą wykorzystać tę lukę do nieautoryzowanego dostępu do pamięci lub usunięcia danych.
Recommendation
Zaleca się aktualizację jądra Linux do najnowszej wersji, która zawiera poprawki dla tej podatności. Dodatkowo, należy monitorować stan systemu plików ocfs2 i przeprowadzać regularne kontrole integralności danych.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix out-of-bounds write in ocfs2_write_end_inline KASAN reports a use-after-free write of 4086 bytes in ocfs2_write_end_inline, called from ocfs2_write_end_nolock during a copy_file_range splice fallback on a corrupted ocfs2 filesystem mounted on a loop device. The actual bug is an out-of-bounds write past the inode block buffer, not a true use-after-free. The write overflows into an adjacent freed page, which KASAN reports as UAF. The root cause is that ocfs2_try_to_write_inline_data trusts the on-disk id_count field to determine whether a write fits in inline data. On a corrupted filesystem, id_count can exceed the physical maximum inline data capacity, causing writes to overflow the inode block buffer. Call trace (crash path): vfs_copy_file_range (fs/read_write.c:1634) do_splice_direct splice_direct_to_actor iter_file_splice_write ocfs2_file_write_iter generic_perform_write ocfs2_write_end ocfs2_write_end_nolock (fs/ocfs2/aops.c:1949) ocfs2_write_end_inline (fs/ocfs2/aops.c:1915) memcpy_from_folio <-- KASAN: write OOB So add id_count upper bound check in ocfs2_validate_inode_block() to alongside the existing i_size check to fix it.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS