kmod, kvm security update

CentOS Errata and Security Advisory CESA-2017:0454

KVM (for Kernel-based Virtual Machine) is a full virtualization solution for
Linux on x86 hardware. Using KVM, one can run multiple virtual machines running
unmodified Linux or Windows images. Each virtual machine has private virtualized
hardware: a network card, disk, graphics adapter, etc.

Security Fix(es):

• Quick emulator (QEMU) built with the Cirrus CLGD 54xx VGA emulator support is
  vulnerable to an out-of-bounds access issue. It could occur while copying VGA
  data via bitblt copy in backward mode. A privileged user inside a guest could
  use this flaw to crash the QEMU process resulting in DoS or potentially execute
  arbitrary code on the host with privileges of QEMU process on the host.
  (CVE-2017-2615)

• Quick emulator (QEMU) built with the Cirrus CLGD 54xx VGA Emulator support is
  vulnerable to an out-of-bounds access issue. The issue could occur while copying
  VGA data in cirrus_bitblt_cputovideo. A privileged user inside guest could use
  this flaw to crash the QEMU process OR potentially execute arbitrary code on
  host with privileges of the QEMU process. (CVE-2017-2620)

Red Hat would like to thank Wjjzhang (Tencent.com Inc.) and Li Qiang (360.cn
Inc.) for reporting CVE-2017-2615.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2017-March/084487.html

Affected packages:
kmod-kvm
kmod-kvm-debug
kvm
kvm-qemu-img
kvm-tools

Upstream details at:
https://access.redhat.com/errata/RHSA-2017:0454