iproute 2.4.7 and earlier allows local users to cause a denial of service via spoofed messages as other users to the kernel netlink interface.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10912
http://www.redhat.com/support/errata/RHSA-2003-317.html
http://www.redhat.com/support/errata/RHSA-2003-316.html
http://www.redhat.com/archives/fedora-announce-list/2004-May/msg00004.html
http://www.novell.com/linux/security/advisories/2005_01_sr.html