CVE-2025-40167ext4: detect invalid INLINE_DATA + EXTENTS flag combination
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Deferred
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from f19d5870cbf72d4cb2a8e1f749dff97af99b071e before 4954d297c91d292630ab43ba4d195dc371ce65d3; from f19d5870cbf72d4cb2a8e1f749dff97af99b071e before f061f7c331fc16250fc82aa68964f35821687217; from f19d5870cbf72d4cb2a8e1f749dff97af99b071e before 2e9e10657b04152ed0d6ecae8d0c02a3405e28f5; from f19d5870cbf72d4cb2a8e1f749dff97af99b071e before 1437c95ab2a28b138d4521653583729f61ccb48b; from f19d5870cbf72d4cb2a8e1f749dff97af99b071e before cb6039b68efa547b676a8a10fc4618d9d1865c23; from f19d5870cbf72d4cb2a8e1f749dff97af99b071e before de985264eef64be8a90595908f2e6a87946dad34; from f19d5870cbf72d4cb2a8e1f749dff97af99b071e before 1f5ccd22ff482639133f2a0fe08f6d19d0e68717; from f19d5870cbf72d4cb2a8e1f749dff97af99b071e before 1d3ad183943b38eec2acf72a0ae98e635dc8456b | CNA record |
References
- https://git.kernel.org/stable/c/4954d297c91d292630ab43ba4d195dc371ce65d3
- https://git.kernel.org/stable/c/f061f7c331fc16250fc82aa68964f35821687217
- https://git.kernel.org/stable/c/2e9e10657b04152ed0d6ecae8d0c02a3405e28f5
- https://git.kernel.org/stable/c/1437c95ab2a28b138d4521653583729f61ccb48b
- https://git.kernel.org/stable/c/cb6039b68efa547b676a8a10fc4618d9d1865c23
- https://git.kernel.org/stable/c/de985264eef64be8a90595908f2e6a87946dad34
- https://git.kernel.org/stable/c/1f5ccd22ff482639133f2a0fe08f6d19d0e68717
- https://git.kernel.org/stable/c/1d3ad183943b38eec2acf72a0ae98e635dc8456b
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.