Improper locking in Linux kernel - CVE-2026-90159
Published: September 19, 2026
Vulnerability identifier: #VU151318
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-90159
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-90159
Install security update from vendor's repository.