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:NUI:RScope
S:CImpact
C:HI:HA:N8.2/CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:NOther