The WRMSR processing functionality in the KVM subsystem in the Linux kernel through 3.17.2 does not properly handle the writing of a non-canonical address to a model-specific register, which allows guest OS users to cause a denial of service (host OS crash) by leveraging guest OS privileges, related to the wrmsrinterception function in arch/x86/kvm/svm.c and the handlewrmsr function in arch/x86/kvm/vmx.c.