Kernel: KVM: nVMX: use-after-free of the hrtimer for emulation of the preemption timer

A use-after-free vulnerability was found in the way the Linux kernel's KVM hypervisor emulates a preemption timer for L2 guests when nested =1 virtualization is enabled. This high resolution timerhrtimer runs when a L2 guest is active. After VM exit, the syncvmcs12 timer object is stopped. The...

kernel: kvm: PIT timer race condition

A race condition flaw was found in the way the Linux kernel's KVM subsystem handled PIT Programmable Interval Timer emulation. A guest user who has access to the PIT I/O ports could use this flaw to crash the host...

UBUNTU-CVE-2014-3611

Race condition in the kvmmigratepittimer function in arch/x86/kvm/i8254.c in the KVM subsystem in the Linux kernel through 3.17.2 allows guest OS users to cause a denial of service host OS crash by leveraging incorrect PIT emulation. A local guest user with access to the PIT i/o ports could use...