The remote host is missing an update to kernel announced via advisory DSA 311-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20311-1

A number of vulnerabilities have been discovered in the Linux kernel. For a more detailed description of the problems addressed, please visit the referenced security advisory. This advisory covers only the i386 (Intel IA32) architectures. Other architectures will be covered by separate advisories. For the stable distribution (woody) on the i386 architecture, these problems have been fixed in kernel-source-2.4.18 version 2.4.18-9, kernel-image-2.4.18-1-i386 version 2.4.18-8, and kernel-image-2.4.18-i386bf version 2.4.18-5woody1. For the unstable distribution (sid) these problems are fixed in the 2.4.20 series kernels based on Debian sources. We recommend that you update your kernel packages. If you are using the kernel installed by the installation system when the 'bf24' option is selected (for a 2.4.x kernel), you should install the kernel-image-2.4.18-bf2.4 package. If you installed a different kernel-image package after installation, you should install the corresponding 2.4.18-1 kernel. You may use the table below as a guide. * If 'uname -r' shows: * Install this package: - ------------------------------------------------------ * 2.4.18-bf2.4 * kernel-image-2.4.18-bf2.4 * 2.4.18-386 * kernel-image-2.4.18-1-386 * 2.4.18-586tsc * kernel-image-2.4.18-1-586tsc * 2.4.18-686 * kernel-image-2.4.18-1-686 * 2.4.18-686-smp * kernel-image-2.4.18-1-686-smp * 2.4.18-k6 * kernel-image-2.4.18-1-k6 * 2.4.18-k7 * kernel-image-2.4.18-1-k7 NOTE: that this kernel is not binary compatible with the previous version. For this reason, the kernel has a different version number and will not be installed automatically as part of the normal upgrade process. Any custom modules will need to be rebuilt in order to work with the new kernel. New PCMCIA modules are provided for all of the above kernels. NOTE: A system reboot will be required immediately after the upgrade in order to replace the running kernel. Remember to read carefully and follow the instructions given during the kernel upgrade process.