The do_ipv6_setsockopt function in net/ipv6/ipv6_sockglue.c in Linux kernel before 2.6.20, and possibly other versions, allows local users to cause a denial of service (oops) by calling setsockopt with the IPV6_RTHDR option name and possibly a zero option length or invalid option value, which triggers a NULL pointer dereference.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11509
https://issues.rpath.com/browse/RPL-1154
http://www.vupen.com/english/advisories/2007/1122
http://www.ubuntu.com/usn/usn-464-1
http://www.securityfocus.com/bid/23142
http://www.redhat.com/support/errata/RHSA-2007-0169.html
http://www.mandriva.com/security/advisories?name=MDKSA-2007:078
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.20.4
http://secunia.com/advisories/25392
http://secunia.com/advisories/25099
http://secunia.com/advisories/25080
http://secunia.com/advisories/24901
http://secunia.com/advisories/24777
http://lists.suse.com/archive/suse-security-announce/2007-May/0001.html