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 wrmsr_interception function in arch/x86/kvm/svm.c and the handle_wrmsr function in arch/x86/kvm/vmx.c.
https://bugzilla.redhat.com/show_bug.cgi?id=1144883
http://www.ubuntu.com/usn/USN-2491-1
http://www.ubuntu.com/usn/USN-2418-1
http://www.ubuntu.com/usn/USN-2417-1
http://www.ubuntu.com/usn/USN-2394-1
http://www.securityfocus.com/bid/70742
http://www.openwall.com/lists/oss-security/2014/10/24/9
http://www.debian.org/security/2014/dsa-3060
http://rhn.redhat.com/errata/RHSA-2015-0869.html
http://lists.opensuse.org/opensuse-security-announce/2015-03/msg00025.html
http://lists.opensuse.org/opensuse-security-announce/2015-03/msg00010.html