KVM (Kernel-based Virtual Machine) is a full virtualization solution forLinux on AMD64 and Intel 64 systems. The qemu-kvm package provides theuser-space component for running virtual machines using KVM.It was found that the QEMU's websocket frame decoder processed incomingframes without limiting resources used to process the header and thepayload. An attacker able to access a guest's VNC console could use thisflaw to trigger a denial of service on the host by exhausting all availablememory and CPU. (CVE-2015-1779)This issue was discovered by Daniel P. Berrange of Red Hat.All qemu-kvm users are advised to upgrade to these updated packages, whichcontain a backported patch to correct this issue. After installing thisupdate, shut down all running virtual machines. Once all virtual machineshave shut down, start them again for this update to take effect.