The __qdisc_run function in net/sched/sch_generic.c in the Linux kernel before 2.6.25 on SMP machines allows local users to cause a denial of service (soft lockup) by sending a large amount of network traffic, as demonstrated by multiple simultaneous invocations of the Netperf benchmark application in UDP_STREAM mode.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9385
https://bugzilla.redhat.com/show_bug.cgi?id=477744
http://www.securityfocus.com/bid/32985
http://www.debian.org/security/2009/dsa-1794
http://secunia.com/advisories/35011
http://secunia.com/advisories/33858
http://secunia.com/advisories/33706
http://rhn.redhat.com/errata/RHSA-2009-0264.html
http://openwall.com/lists/oss-security/2008/12/23/1