kernel security update

CentOS Errata and Security Advisory CESA-2012:0690

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

This update fixes the following security issue:

• It was found that the data_len parameter of the sock_alloc_send_pskb()
  function in the Linux kernel’s networking implementation was not validated
  before use. A local user with access to a TUN/TAP virtual interface could
  use this flaw to crash the system or, potentially, escalate their
  privileges. Note that unprivileged users cannot access TUN/TAP devices
  until the root user grants them access. (CVE-2012-2136, Important)

This update also fixes various bugs. Documentation for these changes will
be available shortly from the Technical Notes document linked to in the
References section.

Users should upgrade to these updated packages, which contain backported
patches to correct this issue, and fix the bugs noted in the Technical
Notes. The system must be rebooted for this update to take effect.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2012-May/080823.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-2012:0690