CVE-2025-38626
MediumCVSS 5.5Summary
W jądrze systemu Linux naprawiono podatność, która mogła prowadzić do paniki systemu przy użyciu opcji montowania 'mode=lfs'. Problem występował w funkcji f2fs_map_blocks(), gdzie nieprawidłowe zarządzanie alokacją bloków mogło prowadzić do wyczerpania przestrzeni.
Risk Assessment
Organizacje mogą doświadczyć awarii systemu, co prowadzi do przestojów i potencjalnej utraty danych, szczególnie w środowiskach intensywnie korzystających z operacji wejścia/wyjścia.
Recommendation
Zaleca się aktualizację jądra systemu Linux do najnowszej wersji, aby usunąć tę podatność oraz monitorowanie systemów pod kątem wystąpienia paniki związanej z f2fs.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to trigger foreground gc during f2fs_map_blocks() in lfs mode w/ "mode=lfs" mount option, generic/299 will cause system panic as below: ------------[ cut here ]------------ kernel BUG at fs/f2fs/segment.c:2835! Call Trace: <TASK> f2fs_allocate_data_block+0x6f4/0xc50 f2fs_map_blocks+0x970/0x1550 f2fs_iomap_begin+0xb2/0x1e0 iomap_iter+0x1d6/0x430 __iomap_dio_rw+0x208/0x9a0 f2fs_file_write_iter+0x6b3/0xfa0 aio_write+0x15d/0x2e0 io_submit_one+0x55e/0xab0 __x64_sys_io_submit+0xa5/0x230 do_syscall_64+0x84/0x2f0 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0010:new_curseg+0x70f/0x720 The root cause of we run out-of-space is: in f2fs_map_blocks(), f2fs may trigger foreground gc only if it allocates any physical block, it will be a little bit later when there is multiple threads writing data w/ aio/dio/bufio method in parallel, since we always use OPU in lfs mode, so f2fs_map_blocks() does block allocations aggressively. In order to fix this issue, let's give a chance to trigger foreground gc in prior to block allocation in f2fs_map_blocks().
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

