SB20260918408 - Incorrect calculation in Linux kernel btrfs
Published: September 18, 2026
Security Bulletin ID
SB20260918408
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Incorrect calculation (CVE-ID: CVE-2026-90259)
CWE-ID: CWE-682 - Incorrect Calculation
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.