CVE-2026-43076
HighCVSS 7.8Summary
W jądrze systemu Linux zidentyfikowano podatność w systemie plików ocfs2, która polega na braku walidacji rozmiaru danych inline podczas odczytu inode. W przypadku uszkodzenia systemu plików, rozmiar i_size inode może przekroczyć rzeczywistą pojemność danych inline, co prowadzi do błędów w dostępie do pamięci.
Risk Assessment
Podatność ta może prowadzić do niebezpiecznych sytuacji, takich jak użycie po zwolnieniu pamięci (use-after-free), co może skutkować nieprzewidywalnym zachowaniem systemu i potencjalnym wyciekiem danych.
Recommendation
Zaleca się aktualizację jądra systemu Linux do wersji, która zawiera poprawkę walidującą rozmiar i_size dla inode z danymi inline, aby zapobiec operacjom na uszkodzonych danych.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ocfs2: validate inline data i_size during inode read When reading an inode from disk, ocfs2_validate_inode_block() performs various sanity checks but does not validate the size of inline data. If the filesystem is corrupted, an inode's i_size can exceed the actual inline data capacity (id_count). This causes ocfs2_dir_foreach_blk_id() to iterate beyond the inline data buffer, triggering a use-after-free when accessing directory entries from freed memory. In the syzbot report: - i_size was 1099511627576 bytes (~1TB) - Actual inline data capacity (id_count) is typically <256 bytes - A garbage rec_len (54648) caused ctx->pos to jump out of bounds - This triggered a UAF in ocfs2_check_dir_entry() Fix by adding a validation check in ocfs2_validate_inode_block() to ensure inodes with inline data have i_size <= id_count. This catches the corruption early during inode read and prevents all downstream code from operating on invalid data.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS