The remote host is missing an update to kernel-source-2.6.8 announced via advisory DSA 1017-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201017-1

Several local and remote vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or the execution of arbitrary code. For details on the issues addressed by the missing update, please visit the referenced security advisories. The following matrix explains which kernel version for which architecture fix the problems mentioned above: Debian 3.1 (sarge) Source 2.6.8-16sarge2 Alpha architecture 2.6.8-16sarge2 AMD64 architecture 2.6.8-16sarge2 HP Precision architecture 2.6.8-6sarge2 Intel IA-32 architecture 2.6.8-16sarge2 Intel IA-64 architecture 2.6.8-14sarge2 Motorola 680x0 architecture 2.6.8-4sarge2 PowerPC architecture 2.6.8-12sarge2 IBM S/390 architecture 2.6.8-5sarge2 Sun Sparc architecture 2.6.8-15sarge2 The following matrix lists additional packages that were rebuilt for compatability with or to take advantage of this update: Debian 3.1 (sarge) kernel-latest-2.6-alpha 101sarge1 kernel-latest-2.6-amd64 103sarge1 kernel-latest-2.6-hppa 2.6.8-1sarge1 kernel-latest-2.6-sparc 101sarge1 kernel-latest-2.6-i386 101sarge1 kernel-latest-powerpc 102sarge1 fai-kernels 1.9.1sarge1 hostap-modules-i386 0.3.7-1sarge1 mol-modules-2.6.8 0.9.70+2.6.8+12sarge1 ndiswrapper-modules-i386 1.1-2sarge1 We recommend that you upgrade your kernel package immediately and reboot