CVE-2026-89807

/// Technical 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().

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References