Incorrect calculation in Linux kernel - CVE-2026-90259
Published: September 18, 2026
Vulnerability identifier: #VU151221
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90259
CWE-ID: CWE-682
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause incorrect freeing of reserved qgroup data.
The vulnerability exists due to an incorrect length calculation in qgroup_free_reserved_data() when freeing reserved qgroup data. A local user can trigger reserved-data range processing to cause incorrect freeing of reserved qgroup data.
Affected software
Linux kernel
How to mitigate CVE-2026-90259
Install security update from vendor's repository.