The nlmclnt_mark_reclaim in clntlock.c in NFS lockd in Linux kernel before 2.6.16 allows remote attackers to cause a denial of service (process crash) and deny access to NFS exports via unspecified vectors that trigger a kernel oops (null dereference) and a deadlock.
http://www.ubuntu.com/usn/usn-395-1
http://www.mandriva.com/security/advisories?name=MDKSA-2007:012
http://support.avaya.com/elmodocs2/security/ASA-2007-287.htm
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10128
https://euvd.enisa.europa.eu/vulnerability/EUVD-2006-5143
http://www.securityfocus.com/bid/21581
http://www.novell.com/linux/security/advisories/2006_57_kernel.html
http://secunia.com/advisories/26289
http://secunia.com/advisories/25838
http://secunia.com/advisories/23752
http://secunia.com/advisories/23384
http://secunia.com/advisories/23361