drm/vmwgfx: fix guest_memory_dirty bitfield clobbered as size

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80702
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 08:16:55 UTC
Updated2026-10-16 20:18:07 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: fix guest_memory_dirty bitfield clobbered as size Two sites in vmwgfx_resource.c assign boolean literals to res->guest_memory_size, which is an unsigned long allocation-size field; the intended target is the adjacent res->guest_memory_dirty bitfield. After the assignments the field holds 0 or 1 instead of the resource's MOB allocation size: - vmw_resource_release() writes 0 (false), and - vmw_resource_unbind_list() writes 1 (true). Subsequent revalidation paths read guest_memory_size when computing the dirty page range (vmw_bo_dirty_transfer_to_res()) and the buffer allocation size (vmw_resource_buf_alloc()), producing zero-length walks or wrap-around ranges that read or write past the MOB bitmap. The dirty-tracking intent of the original code (mark the resource as dirtied since the last sync) is also lost, since guest_memory_dirty is never updated. Rename both assignments to guest_memory_dirty.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001290000 probability, percentile 0.022160000 (date 2026-10-16)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 668b206601c5f5063e03b76784a0d3024fa2b249 21bbe38faee4a195d33a93e3908e307807f7745d git Not specified
CNA Linux Linux affected 668b206601c5f5063e03b76784a0d3024fa2b249 9d6cbb76fe9cd760351f6b0b20f1bf788eab8fa6 git Not specified
CNA Linux Linux affected 668b206601c5f5063e03b76784a0d3024fa2b249 282f261cb035e5f01a486f76d356b7e9dbfba73f git Not specified
CNA Linux Linux affected 668b206601c5f5063e03b76784a0d3024fa2b249 3b2bb16a5b622867140d69925db411ac8ecb3b2b git Not specified
CNA Linux Linux affected 668b206601c5f5063e03b76784a0d3024fa2b249 83195b778f2d109a3a4f3ffaba4dce7e4cdb58aa git Not specified
CNA Linux Linux affected 6.4 Not specified
CNA Linux Linux unaffected 6.4 semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* 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 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9d6cbb76fe9cd760351f6b0b20f1bf788eab8fa6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/83195b778f2d109a3a4f3ffaba4dce7e4cdb58aa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/282f261cb035e5f01a486f76d356b7e9dbfba73f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/21bbe38faee4a195d33a93e3908e307807f7745d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3b2bb16a5b622867140d69925db411ac8ecb3b2b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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