The remote host is missing an update to linux-source-2.6.15 announced via advisory USN-319-1.
A security issue affects the following Ubuntu releases:
Ubuntu 6.06 LTS
This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu.
A race condition has been discovered in the file permission handling of the /proc file system. A local attacker could exploit this to execute arbitrary code with full root privileges.
Solution: The problem can be corrected by upgrading your system to the following package versions: