Sometimes when you run cPanel Security Advisor and you get kernel out of date warning message,The warning message may be something like below:
Current kernel version is out of date. current: 2.6.32-358.2.1.el6, expected: 2.6.32-358.23.2.el6 Update current system software in the “Update System Software” area, and then reboot the system in the “Graceful Server Reboot” area.
In that case you need to update your server kernel.
Login to your server as root via SSH and run following command:
yum update
When asked accept kernel upgrade and Reboot server after update.
Done!!