The atm module in Linux kernel 2.6 before 2.6.14 allows local users to cause a denial of service (panic) via certain socket calls that produce inconsistent reference counts for loadable protocol modules.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10214
http://www.vupen.com/english/advisories/2006/2554
http://www.securityfocus.com/bid/17078
http://www.redhat.com/support/errata/RHSA-2006-0493.html
http://www.mandriva.com/security/advisories?name=MDKSA-2006:059
http://www.debian.org/security/2006/dsa-1103
http://support.avaya.com/elmodocs2/security/ASA-2006-161.htm
http://secunia.com/advisories/21745
http://secunia.com/advisories/20914
http://secunia.com/advisories/20237
http://secunia.com/advisories/19220
http://linux.bkbits.net:8080/linux-2.6/cset%404339c66aLroC1_zunYKhEIbtIWrnwg