The load_segment_descriptor implementation in arch/x86/kvm/emulate.c in the Linux kernel before 4.9.5 improperly emulates a "MOV SS, NULL selector" instruction, which allows guest OS users to cause a denial of service (guest OS crash) or gain guest OS privileges via a crafted application.
Exploitability
AV:LAC:LPR:NUI:NScope
S:UImpact
C:HI:HA:H8.4/CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H