CVE-2026-72091 accel/amdxdna: reject user command submission without a command BO
A local attacker with access to the AMD NPU device node can trigger a kernel null pointer dereference, causing a system crash.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-72091?
CVE-2026-72091 is a vulnerability in Linux, published on 15 Aug 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:
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, and they always set drv_cmd. Reject the invalid handle for user submissions (drv_cmd == NULL) at the submit choke point so every user path is covered.
Found by 0sec automated security-research tooling (https://0sec.ai).
Which versions are affected by CVE-2026-72091?
How do I fix CVE-2026-72091?
Apply the vendor's patch.
Is CVE-2026-72091 being exploited?
There is no known exploitation of CVE-2026-72091 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-72091, DEBIAN-CVE-2026-72091, GHSA-jvc7-qr5g-mx5f, UBUNTU-CVE-2026-72091.