CVE-2026-80887

In the Linux kernel, the following vulnerability has been resolved:

drm/vmwgfx: use check add overflow for shader size+offset bound

vmw shader define() validates the user-supplied shader window against its backing buffer with

(u64)buffer->tbo.base.size < (u64)size + (u64)offset

drm vmw shader create arg::offset is u64 in the uapi; when it is near U64 MAX the unsigned addition wraps and the resulting tiny value passes the check. The unbounded offset is then stored in res->guest memory offset and forwarded to host SVGA shader-create commands.

Use check add overflow() to detect the wrap and compare the resulting endpoint against the buffer size.