The remote host is missing an update to linux-2.6 announced via advisory DSA 1862-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201862-1

A vulnerability has been discovered in the Linux kernel that may lead to privilege escalation. The Common Vulnerabilities and Exposures project identifies the following problem: CVE-2009-2692 Tavis Ormandy and Julien Tinnes discovered an issue with how the sendpage function is initialized in the proto_ops structure. Local users can exploit this vulnerability to gain elevated privileges. For the stable distribution (lenny), this problem has been fixed in version 2.6.26-17lenny2. For the oldstable distribution (etch), this problem will be fixed in updates to linux-2.6 and linux-2.6.24. We recommend that you upgrade your linux-2.6 and user-mode-linux