Answer in brief
CVE-2025-40167 records a High severity (CVSS 7.8) vulnerability in ext4: detect invalid INLINE_DATA + EXTENTS flag combination. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <4954d297c91d292630ab43ba4d195dc371ce65d3 || >=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <f061f7c331fc16250fc82aa68964f35821687217 || >=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <2e9e10657b04152ed0d6ecae8d0c02a3405e28f5 || >=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <1437c95ab2a28b138d4521653583729f61ccb48b || >=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <cb6039b68efa547b676a8a10fc4618d9d1865c23 || >=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <de985264eef64be8a90595908f2e6a87946dad34 || >=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <1f5ccd22ff482639133f2a0fe08f6d19d0e68717 || >=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <1d3ad183943b38eec2acf72a0ae98e635dc8456b | 4954d297c91d292630ab43ba4d195dc371ce65d3, f061f7c331fc16250fc82aa68964f35821687217, 2e9e10657b04152ed0d6ecae8d0c02a3405e28f5, 1437c95ab2a28b138d4521653583729f61ccb48b, cb6039b68efa547b676a8a10fc4618d9d1865c23, de985264eef64be8a90595908f2e6a87946dad34, 1f5ccd22ff482639133f2a0fe08f6d19d0e68717, 1d3ad183943b38eec2acf72a0ae98e635dc8456b |
| Linux/Linuxgeneric | 3.8 | Not reported |
Published upstream
Nov 12, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.