CVE-2026-74446

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

drm/amdkfd: hold event_mutex while checkpointing CRIU events

kfd_criu_checkpoint_events() counts the entries in p->event_idr via

kfd_get_num_events(), allocates an array sized to that count, and then

walks the same IDR to fill it. Neither the count nor the walk holds

p->event_mutex.

The CRIU checkpoint caller holds only p->mutex. Event create and destroy

(kfd_event_create()/kfd_event_destroy()) take p->event_mutex and do not

take p->mutex, so a second thread in the same process can insert or remove

events between the count and the walk. If an event is inserted, the walk

iterates more entries than were counted and writes past the end of the

ev_privs allocation; if an event is removed, the walk dereferences an

entry that is being freed.

Hold p->event_mutex across the count and the walk so both observe a

consistent view of p->event_idr. The lock is released before

copy_to_user(), which only touches the local buffer. T

/// 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