SB2026062574 - Improper locking in Linux kernel bpf

Description

This security bulletin contains information about 1 vulnerability.

1) Improper locking (CVE-ID: CVE-2026-53084)

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 a denial of service.

The vulnerability exists due to improper lock handling in the bpf task_vma iterator when executing a BPF program that iterates task VMAs. A local user can trigger lock ordering conditions to cause a denial of service.

The issue arises because the iterator held a per-VMA lock across the BPF program body, creating a lock ordering problem involving vm_lock, i_rwsem, and mmap_lock.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/13860ca37b8df0b856ee1ce3bdbd7c327d5f53e8
• https://git.kernel.org/stable/c/4cbee026db54cad39c39db4d356100cb133412b3
• https://git.kernel.org/stable/c/592226d138378601ae28eb890e2bbc23ec3600f7
• https://git.kernel.org/stable/c/83b8802c034e843b83a3e1ef6f30cdd4e9ec291c