The remote host is missing an update to linux-2.6 announced via advisory DSA 2012-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202012-1

Two vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or privilege escalation. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2009-3725 Philipp Reisner reported an issue in the connector subsystem which allows unprivileged users to send netlink packets. This allows local users to manipulate settings for uvesafb devices which are normally reserved for privileged users. CVE-2010-0622 Jermome Marchand reported an issue in the futex subsystem that allows a local user to force an invalid futex state which results in a denial of service (oops). This update also includes fixes for regressions introduced by previous updates. See the referenced Debian bug pages for details. For the stable distribution (lenny), this problem has been fixed in version 2.6.26-21lenny4. We recommend that you upgrade your linux-2.6 and user-mode-linux