Improper locking in Linux kernel - CVE-2026-90159

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

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.

Linux kernel
Debian Linux
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux (Debian package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17
linux (Debian package) - update to 6.12.111-1

• https://git.kernel.org/stable/c/61769b9c882a964af3a6ebd9a8e43615f8713234
• https://git.kernel.org/stable/c/84473a7e1813a2da7b759ab1d098a84998c8d3f5
• https://git.kernel.org/stable/c/daeb74f5f398e847d1d42906aec6610406a34fdc
• https://git.kernel.org/stable/c/fe91c3f64a738dd97e8542ad5bdfbe5ac430edf6

• Improper locking in Linux kernel core
• Debian update for linux
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more