The virtual memory implementation in Linux kernel 2.6.x allows local users to cause a denial of service (panic) by running lsof a large number of times in a way that produces a heavy system load.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9390
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=189260
http://www.redhat.com/support/errata/RHSA-2006-0493.html
http://support.avaya.com/elmodocs2/security/ASA-2006-161.htm
http://secunia.com/advisories/21745