NULL pointer dereference in Linux kernel - CVE-2026-89809
Published: September 17, 2026
Vulnerability identifier: #VU150469
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2026-89809
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a null pointer dereference in pqm_debugfs_mqds when reading /sys/kernel/debug/kfd/mqds while a process holds an active KFD queue. A local user can read the vulnerable debugfs interface to cause a denial of service.
The issue is triggered when the queue list contains a kernel-queue entry for which only pqn->kq is valid.
Affected software
Linux kernel
How to mitigate CVE-2026-89809
Install security update from vendor's repository.