The Distributed Lock Manager (DLM) in the cluster manager for Linux kernel 2.6.15 allows remote attackers to cause a denial of service (loss of lock services) by connecting to the DLM port, which probably prevents other processes from accessing the service.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9337
https://exchange.xforce.ibmcloud.com/vulnerabilities/35516
http://www.ubuntu.com/usn/usn-489-2
http://www.ubuntu.com/usn/usn-489-1
http://www.securityfocus.com/bid/24968
http://www.redhat.com/support/errata/RHSA-2007-0940.html
http://secunia.com/advisories/27322