The handle_invept function in arch/x86/kvm/vmx.c in the Linux kernel 3.12 through 3.15 allows privileged KVM guest OS users to cause a denial of service (NULL pointer dereference and host OS crash) via a single-context INVEPT instruction with a NULL EPT pointer. Bug reports: https://bugzilla.kernel.org/show_bug.cgi?id=195167 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1678676