Return of Wrong Status Code in Linux kernel - CVE-2026-31666

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Main Vulnerability Database Vulnerabilities #VU127728

Return of Wrong Status Code in Linux kernel - CVE-2026-31666

Published: April 25, 2026


Vulnerability identifier: #VU127728
CSH Severity: Low
CVSS v4: 6.9 [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]
CVE-ID: CVE-2026-31666
CWE-ID: CWE-393
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

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.


Affected software

Linux kernel
Debian Linux
linux (Debian package)

How to mitigate CVE-2026-31666

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.85-1

External References

Related Security Bulletins