Return of Wrong Status Code in Linux kernel - CVE-2026-31666
Published: April 25, 2026
Vulnerability identifier: #VU127728
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-31666
CWE-ID: CWE-393
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause extent tree corruption.
The vulnerability exists due to incorrect return value handling in lookup_extent_data_ref() when processing extent data reference lookups across leaf boundaries. A local user can trigger the function to return success for a non-matching key to cause extent tree corruption.
How to mitigate CVE-2026-31666
Install security update from vendor's repository.