Out-of-bounds write in Linux kernel - CVE-2026-80702

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to an out-of-bounds read and out-of-bounds write in vmwgfx_resource.c when handling resource release and unbind operations. A local user can trigger the vulnerable code paths to cause a denial of service.

The issue is caused by assignments to the guest_memory_size field instead of the adjacent guest_memory_dirty bitfield, which can lead to zero-length walks or wrap-around ranges while processing the MOB bitmap.

Affected software

How to mitigate CVE-2026-80702

External References

• https://git.kernel.org/stable/c/21bbe38faee4a195d33a93e3908e307807f7745d
• https://git.kernel.org/stable/c/282f261cb035e5f01a486f76d356b7e9dbfba73f
• https://git.kernel.org/stable/c/3b2bb16a5b622867140d69925db411ac8ecb3b2b
• https://git.kernel.org/stable/c/83195b778f2d109a3a4f3ffaba4dce7e4cdb58aa
• https://git.kernel.org/stable/c/9d6cbb76fe9cd760351f6b0b20f1bf788eab8fa6

Related Security Bulletins

• Out-of-bounds write in Linux kernel drm vmwgfx driver