CVE-2026-80700 is a vulnerability in Linux Kernel
Published on August 28, 2026
drm/vmwgfx: validate external BO copy bounds for both stride paths
In 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.
Products Associated with CVE-2026-80700
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Affected Versions
Linux:- Version 9a9716bbbf3dd6b6cbefba3abcc89af8b72631f4 and below 4e0f669e2951b742239c6fe847fcc406fe78748d is affected.
- Version 50f1199250912568606b3778dc56646c10cb7b04 and below e7b25a6011781ebfdbc458552cae6d4156732771 is affected.
- Version 50f1199250912568606b3778dc56646c10cb7b04 and below 042ca38779554687fc32b66a28328e0d9a36c58f is affected.
- Version 50f1199250912568606b3778dc56646c10cb7b04 and below 5e4a2d15637a906cbd9bc98e0bf969f5f713e344 is affected.
- Version 50f1199250912568606b3778dc56646c10cb7b04 and below 706c93c5813caabbb0d0a576c017d15aeec2c113 is affected.
- Version 5c12391ee1ab59cb2f3be3f1f5e6d0fc0c2dc854 is affected.
- Version 6.6.49 and below 6.6.151 is affected.
- Version 6.10.8 and below 6.11 is affected.
- Version 6.11 is affected.
- Before 6.11 is unaffected.
- Version 6.6.151, <= 6.6.* is unaffected.
- Version 6.12.103, <= 6.12.* is unaffected.
- Version 6.18.44, <= 6.18.* is unaffected.
- Version 7.1.8, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.