CVE-2026-72091

Technical Description

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

accel/amdxdna: reject user command submission without a command BO

amdxdna_drm_submit_execbuf() passes the user-supplied command BO handle

straight into amdxdna_cmd_submit() with drv_cmd == NULL. When the handle

is AMDXDNA_INVALID_BO_HANDLE (0), the block that fetches job->cmd_bo is

skipped, leaving it NULL, and no check rejects it on the user path (the

!job->cmd_bo guard lives inside the != INVALID branch).

The job is then armed and pushed to the DRM scheduler.

aie2_sched_job_run() takes the drv_cmd == NULL path and calls

amdxdna_cmd_set_state(job->cmd_bo) -> amdxdna_gem_vmap(NULL) ->

to_gobj(NULL)->dev, a NULL pointer dereference in the drm_sched worker.

A process with access to the accel node on a system with a probed AMD NPU

can trigger a kernel oops with a single AMDXDNA_EXEC_CMD ioctl

(cmd_handles = 0).

Only internal driver commands (SYNC_DEBUG_BO / ATTACH_DEBUG_BO)

legitimately pass AMDXDNA_INVALID_BO_HANDLE

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