Kernel software installed and running inside a Guest VM may exploit memory shared with the GPU Firmware to write data outside the Guest's virtualised GPU memory.
Exploitability
AV:LAC:LPR:LUI:NScope
S:UImpact
C:NI:LA:N3.3/CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:NOther