{"id":"CVE-2025-40137","title":"f2fs: fix to truncate first page in error path of f2fs_truncate()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to truncate first page in error path of f2fs_truncate()\n\nsyzbot reports a bug as below:\n\nloop0: detected capacity change from 0 to 40427\nF2FS-fs (loop0): Wron…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 92dffd01790a5219d234fc83c3ba854f4490b7f4 < 3500d7e1ba53f39bdb8a5aa9c2066b2f08e8c92e","Linux >= 92dffd01790a5219d234fc83c3ba854f4490b7f4 < 83a8e4efea022506a0e049e7206bdf8be9f78148","Linux >= 92dffd01790a5219d234fc83c3ba854f4490b7f4 < a7b7ebdd7045a36454b3e388a2ecf50344fad9e6","Linux >= 92dffd01790a5219d234fc83c3ba854f4490b7f4 < 3b0c8908faa18cded84d64822882a830ab1f4d26","Linux >= 92dffd01790a5219d234fc83c3ba854f4490b7f4 < 9251a9e6e871cb03c4714a18efa8f5d4a8818450","Linux 3.19"],"published":"2025-11-12","updated":"2026-10-30","sourceUpdated":"2026-10-30T12:22:52.489Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-40137","references":[{"url":"https://git.kernel.org/stable/c/3500d7e1ba53f39bdb8a5aa9c2066b2f08e8c92e"},{"url":"https://git.kernel.org/stable/c/83a8e4efea022506a0e049e7206bdf8be9f78148"},{"url":"https://git.kernel.org/stable/c/a7b7ebdd7045a36454b3e388a2ecf50344fad9e6"},{"url":"https://git.kernel.org/stable/c/3b0c8908faa18cded84d64822882a830ab1f4d26"},{"url":"https://git.kernel.org/stable/c/9251a9e6e871cb03c4714a18efa8f5d4a8818450"}],"tags":["cve.org"],"epss":0.00214,"epssPercentile":0.11766,"ingestedAt":"2026-11-03T23:58:20.714Z","slug":"CVE-2025-40137","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to truncate first page in error path of f2fs_truncate()\n\nsyzbot reports a bug as below:\n\nloop0: detected capacity change from 0 to 40427\nF2FS-fs (loop0): Wrong SSA boundary, start(3584) end(4096) blocks(3072)\nF2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock\nF2FS-fs (loop0): invalid crc value\nF2FS-fs (loop0): f2fs_convert_inline_folio: corrupted inline inode ino=3, i_addr[0]:0x1601, run fsck to fix.\n------------[ cut here ]------------\nkernel BUG at fs/inode.c:753!\nRIP: 0010:clear_inode+0x169/0x190 fs/inode.c:753\nCall Trace:\n <TASK>\n evict+0x504/0x9c0 fs/inode.c:810\n f2fs_fill_super+0x5612/0x6fa0 fs/f2fs/super.c:5047\n get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1692\n vfs_get_tree+0x8f/0x2b0 fs/super.c:1815\n do_new_mount+0x2a2/0x9e0 fs/namespace.c:3808\n do_mount fs/namespace.c:4136 [inline]\n __do_sys_mount fs/namespace.c:4347 [inline]\n __se_sys_mount+0x317/0x410 fs/namespace.c:4324\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nDuring f2fs_evict_inode(), clear_inode() detects that we missed to truncate\nall page cache before destorying inode, that is because in below path, we\nwill create page #0 in cache, but missed to drop it in error path, let's fix\nit.\n\n- evict\n - f2fs_evict_inode\n  - f2fs_truncate\n   - f2fs_convert_inline_inode\n    - f2fs_grab_cache_folio\n    : create page #0 in cache\n    - f2fs_convert_inline_folio\n    : sanity check failed, return -EFSCORRUPTED\n  - clear_inode detects that inode->i_data.nrpages is not zero\n\n## Affected\n\n- `Linux >= 92dffd01790a5219d234fc83c3ba854f4490b7f4 < 3500d7e1ba53f39bdb8a5aa9c2066b2f08e8c92e`\n- `Linux >= 92dffd01790a5219d234fc83c3ba854f4490b7f4 < 83a8e4efea022506a0e049e7206bdf8be9f78148`\n- `Linux >= 92dffd01790a5219d234fc83c3ba854f4490b7f4 < a7b7ebdd7045a36454b3e388a2ecf50344fad9e6`\n- `Linux >= 92dffd01790a5219d234fc83c3ba854f4490b7f4 < 3b0c8908faa18cded84d64822882a830ab1f4d26`\n- `Linux >= 92dffd01790a5219d234fc83c3ba854f4490b7f4 < 9251a9e6e871cb03c4714a18efa8f5d4a8818450`\n- `Linux 3.19`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}