Synopsis: Important: kvm security update
Advisory ID: SLSA-2015:0869-1
Issue Date: 2015-04-22
CVE Numbers: CVE-2014-3611
It was found that KVM’s Write to Model Specific Register (WRMSR)
instruction emulation would write non-canonical values passed in by the
guest to certain MSRs in the host’s context. A privileged guest user could
use this flaw to crash the host. (CVE-2014-3610)
A race condition flaw was found in the way the Linux kernel’s KVM
subsystem handled PIT (Programmable Interval Timer) emulation. A guest
user who has access to the PIT I/O ports could use this flaw to crash the
Note: The following procedure must be performed before this update will take
1) Stop all KVM guest virtual machines.
2) Either reboot the hypervisor machine or, as the root user, remove (using
“modprobe -r [module]”) and reload (using “modprobe [module]”) all of the
following modules which are currently running (determined using “lsmod”):
kvm, ksm, kvm-intel or kvm-amd.
3) Restart the KVM guest virtual machines.
or you may restart your system.
– Scientific Linux Development Team