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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2025-40167 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: detect invalid INLINE_DATA + EXTENTS flag combination syzbot reported a BUG_ON in ext4_es_cache_extent() when opening a verity file on a corrupted ext4 filesystem mounted without a journal. The issue is that the filesystem has an inode with both the INLINE_DATA and EXTENTS flags set: EXT4-fs error (device loop0): ext4_cache_extents:545: inode #15: comm syz.0.17: corrupted extent tree: lblk 0 < prev 66 Investigation revealed that the inode has both flags set: DEBUG: inode 15 - flag=1, i_inline_off=164, has_inline=1, extents_flag=1 This is an invalid combination since an inode should have either: - INLINE_DATA: data stored directly in the inode - EXTENTS: data stored in extent-mapped blocks Having both flags causes ext4_has_inline_data() to return true, skipping extent tree validation in __ext4_iget(). The unvalidated out-of-order extents then trigger a BUG_ON in ext4_es_cache_extent() due to integer underflow when calculating hole sizes. Fix this by detecting this invalid flag combination early in ext4_iget() and rejecting the corrupted inode.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/1437c95ab2a28b138d4521653583729f61ccb48b kernel.org
https://git.kernel.org/stable/c/1d3ad183943b38eec2acf72a0ae98e635dc8456b kernel.org
https://git.kernel.org/stable/c/1f5ccd22ff482639133f2a0fe08f6d19d0e68717 kernel.org
https://git.kernel.org/stable/c/2e9e10657b04152ed0d6ecae8d0c02a3405e28f5 kernel.org
https://git.kernel.org/stable/c/4954d297c91d292630ab43ba4d195dc371ce65d3 kernel.org
https://git.kernel.org/stable/c/cb6039b68efa547b676a8a10fc4618d9d1865c23 kernel.org
https://git.kernel.org/stable/c/de985264eef64be8a90595908f2e6a87946dad34 kernel.org
https://git.kernel.org/stable/c/f061f7c331fc16250fc82aa68964f35821687217 kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2025-40167
NVD Published Date:
11/12/2025
NVD Last Modified:
04/14/2026
Source:
kernel.org