The remote host is missing an update to linux-2.6.24 announced via advisory DSA 1787-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201787-1

Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or privilege escalation. For details, please visit the referenced security advisories. For the stable distribution (etch), these problems have been fixed in version 2.6.24-6~etchnhalf.8etch1. We recommend that you upgrade your linux-2.6.24 packages.