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.
3.11.0-12.193.12.0-1.33.12.0-2.53.12.0-2.73.12.0-3.83.12.0-3.93.12.0-4.103.12.0-4.123.12.0-5.133.12.0-7.15+126 more3.13.0-157.2076.5.0-9.94.13.0-16.195.13.0-19.194.2.0-16.194.2.0-17.214.2.0-19.234.3.0-1.104.3.0-2.114.3.0-5.164.3.0-6.174.3.0-7.184.4.0-10.254.4.0-11.26+31 more4.4.0-63.845.3.0-18.195.3.0-24.265.4.0-9.124.4.0-1001.104.4.0-1003.124.4.0-1002.25.13.0-1005.66.5.0-1008.8Exploitability
AV:LAC:LPR:NUI:NScope
S:UImpact
C:HI:HA:HCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H