---
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:

  f2fs: fix to truncate first page in error path of f2fs_truncate()

  syzbot reports a bug as below:

  loop0: detected capacity change from 0 to 40427
  F2FS-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'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

f2fs: fix to truncate first page in error path of f2fs_truncate()

syzbot reports a bug as below:

loop0: detected capacity change from 0 to 40427
F2FS-fs (loop0): Wrong SSA boundary, start(3584) end(4096) blocks(3072)
F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock
F2FS-fs (loop0): invalid crc value
F2FS-fs (loop0): f2fs_convert_inline_folio: corrupted inline inode ino=3, i_addr[0]:0x1601, run fsck to fix.
------------[ cut here ]------------
kernel BUG at fs/inode.c:753!
RIP: 0010:clear_inode+0x169/0x190 fs/inode.c:753
Call Trace:
 <TASK>
 evict+0x504/0x9c0 fs/inode.c:810
 f2fs_fill_super+0x5612/0x6fa0 fs/f2fs/super.c:5047
 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1692
 vfs_get_tree+0x8f/0x2b0 fs/super.c:1815
 do_new_mount+0x2a2/0x9e0 fs/namespace.c:3808
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

During f2fs_evict_inode(), clear_inode() detects that we missed to truncate
all page cache before destorying inode, that is because in below path, we
will create page #0 in cache, but missed to drop it in error path, let's fix
it.

- evict
 - f2fs_evict_inode
  - f2fs_truncate
   - f2fs_convert_inline_inode
    - f2fs_grab_cache_folio
    : create page #0 in cache
    - f2fs_convert_inline_folio
    : sanity check failed, return -EFSCORRUPTED
  - clear_inode detects that inode->i_data.nrpages is not zero

## Affected

- `Linux >= 92dffd01790a5219d234fc83c3ba854f4490b7f4 < 3500d7e1ba53f39bdb8a5aa9c2066b2f08e8c92e`
- `Linux >= 92dffd01790a5219d234fc83c3ba854f4490b7f4 < 83a8e4efea022506a0e049e7206bdf8be9f78148`
- `Linux >= 92dffd01790a5219d234fc83c3ba854f4490b7f4 < a7b7ebdd7045a36454b3e388a2ecf50344fad9e6`
- `Linux >= 92dffd01790a5219d234fc83c3ba854f4490b7f4 < 3b0c8908faa18cded84d64822882a830ab1f4d26`
- `Linux >= 92dffd01790a5219d234fc83c3ba854f4490b7f4 < 9251a9e6e871cb03c4714a18efa8f5d4a8818450`
- `Linux 3.19`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.