The vcpu_scan_ioapic function in arch/x86/kvm/x86.c in the Linux kernel through 4.19.2 allows local users to cause a denial of service (NULL pointer dereference and BUG) via crafted system calls that reach a situation where ioapic is uninitialized.
4.4.0-1038.414.15.0-1037.39~14.04.24.4.0-142.168~14.04.14.4.0-142.1684.4.0-1075.854.15.0-1032.34~16.04.14.15.0-1037.39~16.04.14.15.0-1027.28~16.04.14.15.0-45.48~16.04.14.4.0-1040.46Exploitability
AV:LAC:LPR:LUI:NScope
S:UImpact
C:NI:NA:HCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H