Answer in brief
CVE-2025-40190 records a High severity (CVSS 7.8) vulnerability in ext4: guard against EA inode refcount underflow in xattr update. The current sources do not mark it as known exploited. The current feed maps 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). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ea39e712c2f5ae148ee5515798ae03523673e002 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1cfb3e4ddbdc8e02e637b8852540bd4718bf4814 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <505e69f76ac497e788f4ea0267826ec7266b40c8 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3d6269028246f4484bfed403c947a114bb583631 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <79ea7f3e11effe1bd9e753172981d9029133a278 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6b879c4c6bbaab03c0ad2a983953bd1410bb165e || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <440b003f449a4ff2a00b08c8eab9ba5cd28f3943 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <57295e835408d8d425bef58da5253465db3d6888 || >=0 <5.4.301 || >=0 <5.10.246 || >=0 <5.15.195 || >=0 <6.1.157 || >=0 <6.6.113 || >=0 <6.12.54 || >=0 <6.17.4 | ea39e712c2f5ae148ee5515798ae03523673e002, 1cfb3e4ddbdc8e02e637b8852540bd4718bf4814, 505e69f76ac497e788f4ea0267826ec7266b40c8, 3d6269028246f4484bfed403c947a114bb583631, 79ea7f3e11effe1bd9e753172981d9029133a278, 6b879c4c6bbaab03c0ad2a983953bd1410bb165e, 440b003f449a4ff2a00b08c8eab9ba5cd28f3943, 57295e835408d8d425bef58da5253465db3d6888, 5.4.301, 5.10.246, 5.15.195, 6.1.157, 6.6.113, 6.12.54, 6.17.4 |
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: guard against EA inode refcount underflow in xattr update syzkaller found a path where ext4_xattr_inode_update_ref() reads an EA inode refcount that is already <= 0 and then applies ref_change (often -1). That lets the refcount underflow and we proceed with a bogus value, triggering errors like: EXT4-fs error: EA inode <n> ref underflow: ref_count=-1 ref_change=-1 EXT4-fs warning: ea_inode dec ref err=-117 Make the invariant explicit: if the current refcount is non-positive, treat this as on-disk corruption, emit ext4_error_inode(), and fail the operation with -EFSCORRUPTED instead of updating the refcount. Delete the WARN_ONCE() as negative refcounts are now impossible; keep error reporting in ext4_error_inode(). This prevents the underflow and the follow-on orphan/cleanup churn.
Quoted source text, attributed separately from HOL analysis.