Old kernel: exploitable root security holes

Hi, i recieve this email from my server

IMPORTANT: Do not ignore this message.
This message is to inform you that the
machine john.mydomain.com is running an older kernel which is known to have exploitable root security holes. We recommend that you upgrade your kernel as soon as possible. If your admin does not know how to upgrade your kernel; Most hosts will charge a minimal fee to upgrade your kernel for you. For more information on upgrading your kernel please see the below urls:

http://www.kernel.org/

http://www.linuxdoc.org/HOWTO/Kernel-HOWTO.html

!!! If you have never upgraded your kernel before, we recommend you aquire
assistance with the upgrade as a failed upgrade can result in an
unbootable system !!!

For more information on recent security holes: https://rhn.redhat.com/errata/RHSA-2002-206.html
https://rhn.redhat.com/errata/RHSA-2002-262.html
What should i do? i know nothing about kernel upgrade though, is this hard to do? do you need a physical access to the machine?

Thanks All

 

 

 

 

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