The remote host is missing an update to kernel-source-2.6.8 et. al. announced via advisory DSA 1111-2.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201111-2

It was discovered that a race condition in the process filesystem can lead to privilege escalation. The following matrix explains which kernel version for which architecture fixes the problem mentioned above: Debian 3.1 (sarge) Source 2.6.8-16sarge4 Alpha architecture 2.6.8-16sarge4 AMD64 architecture 2.6.8-12sarge4 Intel IA-32 architecture 2.6.8-16sarge4 Intel IA-64 architecture 2.6.8-14sarge4 PowerPC architecture 2.6.8-12sarge4 Sun Sparc architecture 2.6.8-15sarge4 IBM S/390 2.6.8-5sarge4 Motorola 680x0 2.6.8-4sarge4 HP Precision 2.6.8-6sarge3 FAI 1.9.1sarge3 The initial advisory lacked builds for the IBM S/390, Motorola 680x0 and HP Precision architectures, which are now provided. Also, the kernels for the FAI installer have been updated. We recommend that you upgrade your kernel package immediately and reboot