CVE-2026-89802

/// Technical 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.

/// 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