SB2025032734 - Use-after-free in Linux kernel btrfs
Published: March 27, 2025 Updated: May 11, 2025
Security Bulletin ID
SB2025032734
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2025-21879)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the btrfs_scan_root() function in fs/btrfs/extent_map.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.