The patch_instruction function in hw/i386/kvmvapic.c in QEMU does not initialize the imm32 variable, which allows local guest OS administrators to obtain sensitive information from host stack memory by accessing the Task Priority Register (TPR).
Exploitability
AV:LAC:LPR:LUI:NScope
S:CImpact
C:HI:NA:N6.5/CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N