arch/arm/kvm/arm.c in the Linux kernel before 3.10 on the ARM platform, when KVM is used, allows host OS users to cause a denial of service (NULL pointer dereference, OOPS, and host OS crash) or possibly have unspecified other impact by omitting vCPU initialization before a KVM_GET_REG_LIST ioctl call.
https://www.kernel.org/pub/linux/kernel/v3.x/patch-3.10.bz2
http://www.securityfocus.com/bid/61995