CVE-2026-74442

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

drm/vmwgfx: avoid destroy_workqueue(NULL) on vkms init failure

Two paths through vmw_vkms_init() can leave vmw->crc_workq NULL while

still leaving the rest of the driver in a state that calls

vmw_vkms_cleanup() at module unload:

1. vmw_host_get_guestinfo(GUESTINFO_VBLANK, ...) failing or

returning an oversized buffer -- the common case on hosts

without a VBLANK guestinfo entry -- early-returned before the

workqueue allocation.

2. alloc_ordered_workqueue() returning NULL on memory pressure.

vmw_vkms_cleanup() then calls destroy_workqueue(NULL), which

dereferences wq->name and panics.

Fix the first case by removing the early return: vmw->vkms_enabled

is already false on the rpci-failure path so no work will ever be

queued, and allocating the workqueue unconditionally keeps the

control flow simple. Fix the second case by guarding the cleanup

with a NULL check, since alloc_ordered_workqueue() can s

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