AZL-70091
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-70091.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-70091
- Upstream
- Published
- 2025-11-12T22:15:45Z
- Modified
- 2026-04-01T05:21:41.505914Z
- Summary
- CVE-2025-40190 affecting package kernel for versions less than 6.6.117.1-1
- Details
-
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 ext4xattrinodeupdateref() 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: refcount=-1 refchange=-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 ext4errorinode(), and fail the operation with -EFSCORRUPTED instead of updating the refcount. Delete the WARNONCE() as negative refcounts are now impossible; keep error reporting in ext4error_inode().
This prevents the underflow and the follow-on orphan/cleanup churn.
- References