SB20260424193 - Improper locking in Linux kernel bpf progs

Description

This security bulletin contains information about 1 vulnerability.

1) Improper locking (CVE-ID: CVE-2026-31526)

CWE-ID: CWE-667 - Improper Locking

CVSSv4: 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/E:U/U:Clear

The vulnerability allows a local user to cause various issues.

The vulnerability exists due to improper lock state validation in process_bpf_exit_full() when handling exception exits from static BPF subprograms. A local user can trigger bpf_throw() from a static subprogram to cause various issues.

The issue occurs because exception unwinding bypasses intermediate frame cleanup, which can leave user-acquired RCU, preempt, or IRQ-related locks unreleased.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/5a399f3117642494e35545f6ca397d3e177c1f9b
• https://git.kernel.org/stable/c/6c2128505f61b504c79a20b89596feba61388112
• https://git.kernel.org/stable/c/c0281da1f2aa5c2fca3a05f79b86bea96591c358