The mode4and5 write functions in hw/display/cirrus_vga.c in Qemu allow local OS guest privileged users to cause a denial of service (out-of-bounds write access and Qemu process crash) via vectors related to dst calculation.
Exploitability
AV:LAC:LPR:HUI:NScope
S:CImpact
C:NI:NA:H6/CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H