SB20260508145 - Memory leak in Linux kernel btrfs
Published: May 8, 2026
Security Bulletin ID
SB20260508145
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Memory leak (CVE-ID: CVE-2026-43393)
CWE-ID: CWE-401 - Missing release of memory after effective lifetime
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a memory leak in btrfs_map_block() when handling invalid block mapping states after calling btrfs_chunk_map_num_copies(). A local user can trigger an early -EINVAL return to cause a denial of service.
Remediation
Install update from vendor's website.