ext4: detect invalid INLINE_DATA + EXTENTS flag combination

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-40167
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-11-12 11:15:47 UTC
Updated2026-07-30 06:24:14 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS: 0.001500000 probability, percentile 0.046870000 (date 2026-07-31)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f19d5870cbf72d4cb2a8e1f749dff97af99b071e 4954d297c91d292630ab43ba4d195dc371ce65d3 git Not specified
CNA Linux Linux affected f19d5870cbf72d4cb2a8e1f749dff97af99b071e f061f7c331fc16250fc82aa68964f35821687217 git Not specified
CNA Linux Linux affected f19d5870cbf72d4cb2a8e1f749dff97af99b071e 2e9e10657b04152ed0d6ecae8d0c02a3405e28f5 git Not specified
CNA Linux Linux affected f19d5870cbf72d4cb2a8e1f749dff97af99b071e 1437c95ab2a28b138d4521653583729f61ccb48b git Not specified
CNA Linux Linux affected f19d5870cbf72d4cb2a8e1f749dff97af99b071e cb6039b68efa547b676a8a10fc4618d9d1865c23 git Not specified
CNA Linux Linux affected f19d5870cbf72d4cb2a8e1f749dff97af99b071e de985264eef64be8a90595908f2e6a87946dad34 git Not specified
CNA Linux Linux affected f19d5870cbf72d4cb2a8e1f749dff97af99b071e 1f5ccd22ff482639133f2a0fe08f6d19d0e68717 git Not specified
CNA Linux Linux affected f19d5870cbf72d4cb2a8e1f749dff97af99b071e 1d3ad183943b38eec2acf72a0ae98e635dc8456b git Not specified
CNA Linux Linux affected 3.8 Not specified
CNA Linux Linux unaffected 3.8 semver Not specified
CNA Linux Linux unaffected 5.4.301 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.246 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.196 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.158 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.114 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.55 6.12.* semver Not specified
CNA Linux Linux unaffected 6.17.5 6.17.* semver Not specified
CNA Linux Linux unaffected 6.18 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1f5ccd22ff482639133f2a0fe08f6d19d0e68717 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1d3ad183943b38eec2acf72a0ae98e635dc8456b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1437c95ab2a28b138d4521653583729f61ccb48b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cb6039b68efa547b676a8a10fc4618d9d1865c23 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f061f7c331fc16250fc82aa68964f35821687217 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2e9e10657b04152ed0d6ecae8d0c02a3405e28f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/de985264eef64be8a90595908f2e6a87946dad34 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4954d297c91d292630ab43ba4d195dc371ce65d3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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