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.
http://www.openwall.com/lists/oss-security/2013/08/26/4
http://www.securityfocus.com/bid/61995
https://github.com/torvalds/linux/commit/e8180dcaa8470ceca21109f143876fdcd9fe050a