drm/nouveau/uvmm: fix NULL deref unwinding an OP_MAP_SPARSE op (CVE-2026-89802) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89802

drm/nouveau/uvmm: fix NULL deref unwinding an OP_MAP_SPARSE op

Answer in brief

CVE-2026-89802 records a Unknown severity vulnerability in drm/nouveau/uvmm: fix NULL deref unwinding an OP_MAP_SPARSE op. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 16, 2026Updated Sep 16, 2026Source checked Sep 16, 2026First seen by HOL Sep 16, 2026Material review Sep 16, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=b88baab828713ce0b49b185444b2ee83bed373a8 <3bf493cf7ed0c2b3df728977a257e0d99b4db1c6 \|\| >=b88baab828713ce0b49b185444b2ee83bed373a8 <b7dc03e09313d22a6d230b759de3b05d504c008f \|\| >=b88baab828713ce0b49b185444b2ee83bed373a8 <3857238de6bce6c1573e8cb86c37b067e5208f05 \|\| >=b88baab828713ce0b49b185444b2ee83bed373a8 <412a6ceb56d501ef2f8202e26ab4b5d4dfbca566	3bf493cf7ed0c2b3df728977a257e0d99b4db1c6, b7dc03e09313d22a6d230b759de3b05d504c008f, 3857238de6bce6c1573e8cb86c37b067e5208f05, 412a6ceb56d501ef2f8202e26ab4b5d4dfbca566
Linux/Linuxgeneric	6.6	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 3bf493cf7ed0c2b3df728977a257e0d99b4db1c6 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 16, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.