CVE-2026-89802 drm/nouveau/uvmm: fix NULL deref unwinding an OP_MAP_SPARSE op
A local attacker with render-node access can trigger a kernel crash via a NULL pointer dereference in the nouveau driver during sparse map operations.
- 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-2026-89802?
CVE-2026-89802 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/nouveau/uvmm: fix NULL deref unwinding an OP_MAP_SPARSE op
Each bind_job_op is zeroed by kzalloc_obj() in bind_job_op_from_uop(), and the OP_MAP_SPARSE case in nouveau_uvmm_bind_job_submit() only creates a region, so op->ops stays NULL for a successfully processed sparse map.
If a later op in the same job fails, the reverse unwind loop revisits that op and calls drm_gpuva_ops_free(&uvmm->base, op->ops) unconditionally. drm_gpuva_ops_free() dereferences its argument right away (list_for_each_entry_safe on &ops->list), so a NULL op->ops oopses. The path is reachable by any render-node fd holder, since NOUVEAU_VM_BIND is DRM_RENDER_ALLOW.
Guard the free with IS_ERR_OR_NULL(), as nouveau_uvmm_bind_job_cleanup() already does for the identical free.
Which versions are affected by CVE-2026-89802?
How do I fix CVE-2026-89802?
Apply the vendor's patch.
Is CVE-2026-89802 being exploited?
There is no known exploitation of CVE-2026-89802 in the wild and no public exploit code.
Sources
Also known as AZL-101243, BELL-CVE-2026-89802, DEBIAN-CVE-2026-89802, GHSA-c2hc-j8hj-4mw2, UBUNTU-CVE-2026-89802.