kernel security update

CentOS Errata and Security Advisory CESA-2016:2962

The kernel packages contain the Linux kernel, the core of any Linux operating
system.

Security Fix(es):

• A use-after-free vulnerability was found in the kernels socket recvmmsg
  subsystem. This may allows remote attackers to corrupt memory and may allow
  execution of arbitrary code. This corruption takes place during the error
  handling routines within __sys_recvmmsg() function. (CVE-2016-7117, Important)

Bug Fix(es):

• Previously, guest virtual machines (VMs) on a Hyper-V server cluster got in
  some cases rebooted during the graceful node failover test, because the host
  kept sending heartbeat packets independently of guests responding to them. This
  update fixes the bug by properly responding to all the heartbeat messages in the
  queue, even if they are pending. As a result, guest VMs no longer get rebooted
  under the described circumstances. (BZ#1391167)

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2016-December/084344.html

Affected packages:
kernel
kernel-PAE
kernel-PAE-devel
kernel-debug
kernel-debug-devel
kernel-devel
kernel-doc
kernel-headers
kernel-xen
kernel-xen-devel

Upstream details at:
https://access.redhat.com/errata/RHSA-2016:2962