The remote host is missing an update to linux-source-2.6.8.1 announced via advisory USN-30-1.
A number of vulnerabilities have been found in ther kernel. For a complete description of the issues associated with this advisory, please read the referenced link below.
Solution: The problem can be corrected by upgrading the affected package to version 2.6.8.1-16.1. You need to reboot the computer after doing a standard system upgrade to effect the necessary changes.