The kernel-rt packages contain the Linux kernel, the core of any Linux operating system.
This update provides a build of the kernel-rt package for MRG 2.3, which is layered on Red Hat Enterprise Linux 6.
Descriptions of the security fixes provided in this advisory can be viewed at https://rhn.redhat.com/errata/RHSA-2013-0829.html. The bug fixes provided in this advisory are documented below:

Bug Fixes

BZ#918098
Portions of buildID were missing from vmlinux and vDSO images, consequently it was not possible to use systemtap or make annotations in perf. This update sets the AFTER_LINK variable which gets the buildID components into the final emdedded images. Systemtap and perf now work as expected.
BZ#923222
A race condition in the bonding driver caused the system to be unresponsive. This update adds a synchronize_net() in netdev_rx_handler_unregister(), ensuring that a rcuprotected reader is guaranteed to see a non NULL rx_handler_data, thus preventing the race condition in the bonding driver and restoring system responsiveness.
BZ#921554
Cgroup configurations have been enabled in the Realtime kernel version 3.6, so its services and capabilities match Red Hat Enterprise Linux more closely.
BZ#914765
The DEFAULTKERNEL parameter was not modified in /etc/sysconfig/kernel for the kernel-rt package. Consequently, upgrading any non-Realtime kernels reset the default kernel to a non-Realtime kernel. All MRG Realtime kernel variants are now classified as 'kernel-rt' when installing or upgrading, so upgrades of non-Realtime kernels do not reset the default kernel, and the Realtime kernel remains the default as expected.
BZ#927026
Previously the NO_HZ option was enabled by default, which could have adverse effects on system performance. The NO_HZ option is now disabled by default to improve performance, but users can still enable it if necessary using the CONFIG_NO_HZ boot option.
Users are advised upgrade to these updated kernel-rt packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.