CVE-2025-38627
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
W jądrze systemu Linux zidentyfikowano podatność związana z nieprawidłowym zarządzaniem pamięcią w f2fs, co może prowadzić do sytuacji użycia po zwolnieniu (UAF) struktury f2fs_inode_info. Problem występuje, gdy plik jest usuwany natychmiast po odczycie, a wątek przetwarzający zadania post_read_wq nie został jeszcze uruchomiony.
Risk Assessment
Podatność ta może prowadzić do nieprzewidywalnych zachowań systemu, w tym do awarii lub zawieszenia systemu, co może wpłynąć na dostępność danych i stabilność usług. W szczególności, może to prowadzić do utraty danych lub uszkodzenia systemu plików.
Recommendation
Zaleca się aktualizację jądra systemu Linux do najnowszej wersji, w której ta podatność została naprawiona. Należy również monitorować system pod kątem nieprawidłowego działania oraz przeprowadzić testy po aktualizacji.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: f2fs: compress: fix UAF of f2fs_inode_info in f2fs_free_dic The decompress_io_ctx may be released asynchronously after I/O completion. If this file is deleted immediately after read, and the kworker of processing post_read_wq has not been executed yet due to high workloads, It is possible that the inode(f2fs_inode_info) is evicted and freed before it is used f2fs_free_dic. The UAF case as below: Thread A Thread B - f2fs_decompress_end_io - f2fs_put_dic - queue_work add free_dic work to post_read_wq - do_unlink - iput - evict - call_rcu This file is deleted after read. Thread C kworker to process post_read_wq - rcu_do_batch - f2fs_free_inode - kmem_cache_free inode is freed by rcu - process_scheduled_works - f2fs_late_free_dic - f2fs_free_dic - f2fs_release_decomp_mem read (dic->inode)->i_compress_algorithm This patch store compress_algorithm and sbi in dic to avoid inode UAF. In addition, the previous solution is deprecated in [1] may cause system hang. [1] https://lore.kernel.org/all/[email protected]