drm/vmwgfx: validate external BO copy bounds for both stride paths

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80700
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 08:16:55 UTC
Updated2026-08-28 08:16:55 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: validate external BO copy bounds for both stride paths vmw_external_bo_copy() trusts caller-supplied offsets, strides, and heights and operates on imported dma-buf vmaps: - The equal-stride memcpy() bound was clamped after subtracting the offsets from dst_size and src_size; an offset larger than the BO size wraps the unsigned subtraction to a huge value and the resulting memcpy() runs off the end of the vmap. dst_stride * height is also a u32 multiplication that can overflow. - The non-equal-stride row-by-row path had no bound at all. The loop touches bytes through offset + (height - 1) * stride + width_in_bytes, with only a WARN_ON(dst_stride < width_in_bytes), and could likewise step past the end of either mapping. The offsets and strides are derived from STDU/SOU plane state, so a configured CRTC submitting a crafted atomic commit on an imported framebuffer can reach this path. Validate the exact row-copy endpoint against each BO's size up front using check_mul_overflow() and check_add_overflow(). Use the bulk memcpy() path only when width_in_bytes covers the whole stride; otherwise copy one row at a time so partial-row updates near the bottom of a framebuffer remain valid. Also reject zero strides and stride < width_in_bytes, both of which the row-by-row path cannot represent safely.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9a9716bbbf3dd6b6cbefba3abcc89af8b72631f4 4e0f669e2951b742239c6fe847fcc406fe78748d git Not specified
CNA Linux Linux affected 50f1199250912568606b3778dc56646c10cb7b04 e7b25a6011781ebfdbc458552cae6d4156732771 git Not specified
CNA Linux Linux affected 50f1199250912568606b3778dc56646c10cb7b04 042ca38779554687fc32b66a28328e0d9a36c58f git Not specified
CNA Linux Linux affected 50f1199250912568606b3778dc56646c10cb7b04 5e4a2d15637a906cbd9bc98e0bf969f5f713e344 git Not specified
CNA Linux Linux affected 50f1199250912568606b3778dc56646c10cb7b04 706c93c5813caabbb0d0a576c017d15aeec2c113 git Not specified
CNA Linux Linux affected 5c12391ee1ab59cb2f3be3f1f5e6d0fc0c2dc854 git Not specified
CNA Linux Linux affected 6.6.49 6.6.151 semver Not specified
CNA Linux Linux affected 6.10.8 6.11 semver Not specified
CNA Linux Linux affected 6.11 Not specified
CNA Linux Linux unaffected 6.11 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/e7b25a6011781ebfdbc458552cae6d4156732771 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/706c93c5813caabbb0d0a576c017d15aeec2c113 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5e4a2d15637a906cbd9bc98e0bf969f5f713e344 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/042ca38779554687fc32b66a28328e0d9a36c58f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4e0f669e2951b742239c6fe847fcc406fe78748d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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