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.A heap buffer overflow flaw was found in the way QEMU's NE2000 NICemulation implementation handled certain packets received over the network.A privileged user inside a guest could use this flaw to crash the QEMUinstance (denial of service) or potentially execute arbitrary code onthe host. (CVE-2015-5279)Red Hat would like to thank Qinghao Tang of QIHU 360 Inc. for reportingthis issue.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.