The remote host is missing an update to linux-2.6 announced via advisory DSA 1575-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201575-1

A vulnerability has been discovered in the Linux kernel that may lead to a denial of service. The Common Vulnerabilities and Exposures project identifies the following problem: CVE-2008-1669 Alexander Viro discovered a race condition in the fcntl code that may permit local users on multi-processor systems to execute parallel code paths that are otherwise prohibited and gain re-ordered access to the descriptor table. For the stable distribution (etch), this problem has been fixed in version 2.6.18.dfsg.1-18etch4. For the unstable distribution(sid), this problem has been fixed in version 2.6.25-2. We recommend that you upgrade your linux-2.6, fai-kernels, and