SB2026091950 - Improper locking in Linux kernel core
Published: September 19, 2026
Security Bulletin ID
SB2026091950
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper locking (CVE-ID: CVE-2026-90159)
CWE-ID: CWE-667 - Improper Locking
CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local privileged user to trigger a kernel warning.
The vulnerability exists due to improper locking in bpf_setsockopt() and bpf_getsockopt() when invoking the helpers from cgroup UNIX getname hooks. A local privileged user can call bpf_setsockopt() or bpf_getsockopt() from a BPF program attached to a BPF_CGROUP_UNIX_GETPEERNAME or BPF_CGROUP_UNIX_GETSOCKNAME hook to trigger a kernel warning.
Remediation
Install update from vendor's website.