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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74442
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:48 UTC
Updated2026-08-15 13:17:48 UTC
DescriptionIn 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 still fail under low memory.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7b0062036c3b71b4a69e244ecf0502c06c4cf5f0 7c701778c6a369769992614dac8dc00c8ac72afc git Not specified
CNA Linux Linux affected 7b0062036c3b71b4a69e244ecf0502c06c4cf5f0 96efee36453b697ccbaf75091b7a1807c11809dd git Not specified
CNA Linux Linux affected 7b0062036c3b71b4a69e244ecf0502c06c4cf5f0 0ee0532f1d405d37f38c44cbba87342e63d3bbd4 git Not specified
CNA Linux Linux affected 7b0062036c3b71b4a69e244ecf0502c06c4cf5f0 05eaa887e7b4f40fba425f8a1d7a5a8a043092a6 git Not specified
CNA Linux Linux affected 6.10 Not specified
CNA Linux Linux unaffected 6.10 semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc6 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/05eaa887e7b4f40fba425f8a1d7a5a8a043092a6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0ee0532f1d405d37f38c44cbba87342e63d3bbd4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/96efee36453b697ccbaf75091b7a1807c11809dd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7c701778c6a369769992614dac8dc00c8ac72afc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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