CVE-2026-89807 drm/amdkfd: guard against NULL restore_mqd in CRIU queue restore
A local attacker with CAP_CHECKPOINT_RESTORE privileges can trigger a kernel NULL pointer dereference and panic the system via crafted CRIU queue restore operations.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-89807?
CVE-2026-89807 is a vulnerability in Linux, published on 16 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
drm/amdkfd: guard against NULL restore_mqd in CRIU queue restore
Both create_queue_cpsch() and create_queue_nocpsch() unconditionally call mqd_mgr->restore_mqd() when a CRIU restore is in progress (qd != NULL), with no NULL guard. On any system where restore_mqd is not implemented for the given queue type, a user holding CAP_CHECKPOINT_RESTORE can trigger a kernel NULL pointer dereference and panic the machine by issuing KFD_IOC_CRIU_OP_RESTORE with a crafted queue restore object. Note that checkpoint_mqd is likewise unimplemented on GFX12, so no legitimate CRIU image can reach this path — only a hand-crafted restore payload.
Add a NULL guard for restore_mqd immediately after mqd_mgr is resolved, unwinding via the existing error labels and returning -EOPNOTSUPP if the callback is not implemented. This mirrors the existing checkpoint_mqd guard in checkpoint_mqd().
Which versions are affected by CVE-2026-89807?
How do I fix CVE-2026-89807?
Apply the vendor's patch.
Is CVE-2026-89807 being exploited?
There is no known exploitation of CVE-2026-89807 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-89807, DEBIAN-CVE-2026-89807, GHSA-4j65-qcr2-qw3x, UBUNTU-CVE-2026-89807.