CVE-2009-2194
Apple Mac OS X 10.5 before 10.5.8 does not properly share file descriptors over local sockets, which allows local users to cause a denial of service (system crash) by placing file descriptors in messages sent to a socket that has no receiver, related to a "synchronization issue."
Date published : 2009-08-06
http://lists.apple.com/archives/security-announce/2009/Aug/msg00001.html