CVE-2026-89802

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxb88baab828713ce0b49b185444b2ee83bed373a8 < 3bf493cf7ed0c2b3df728977a257e0d99b4db1c6affected
LinuxLinuxb88baab828713ce0b49b185444b2ee83bed373a8 < b7dc03e09313d22a6d230b759de3b05d504c008faffected
LinuxLinuxb88baab828713ce0b49b185444b2ee83bed373a8 < 3857238de6bce6c1573e8cb86c37b067e5208f05affected
LinuxLinuxb88baab828713ce0b49b185444b2ee83bed373a8 < 412a6ceb56d501ef2f8202e26ab4b5d4dfbca566affected
LinuxLinux6.6affected
LinuxLinux0 < 6.6unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.51 <= 6.18.*unaffected
LinuxLinux7.2.5 <= 7.2.*unaffected
LinuxLinux7.3-rc2 <= *unaffected

Weaknesses

References