CVE-2026-80702 is a vulnerability in Linux Kernel
Published on August 28, 2026
drm/vmwgfx: fix guest_memory_dirty bitfield clobbered as size
In 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.
Products Associated with CVE-2026-80702
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Affected Versions
Linux:- Version 668b206601c5f5063e03b76784a0d3024fa2b249 and below 21bbe38faee4a195d33a93e3908e307807f7745d is affected.
- Version 668b206601c5f5063e03b76784a0d3024fa2b249 and below 9d6cbb76fe9cd760351f6b0b20f1bf788eab8fa6 is affected.
- Version 668b206601c5f5063e03b76784a0d3024fa2b249 and below 282f261cb035e5f01a486f76d356b7e9dbfba73f is affected.
- Version 668b206601c5f5063e03b76784a0d3024fa2b249 and below 3b2bb16a5b622867140d69925db411ac8ecb3b2b is affected.
- Version 668b206601c5f5063e03b76784a0d3024fa2b249 and below 83195b778f2d109a3a4f3ffaba4dce7e4cdb58aa is affected.
- Version 6.4 is affected.
- Before 6.4 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.