SB20260815138 - Improper locking in Linux kernel bpf
Published: August 15, 2026
Security Bulletin ID
SB20260815138
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper locking (CVE-ID: CVE-2026-74337)
CWE-ID: CWE-667 - Improper Locking
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper lock handling in the BPF LRU list implementation when NMI and tracepoint BPF programs re-enter per-CPU or global LRU locks on the same CPU. A local user can trigger recursive lock acquisition to cause a denial of service.
The issue can result in an AA deadlock on the affected lock paths.
Remediation
Install update from vendor's website.