The Linux Kernel before 2.6.15.5 allows local users to cause a denial of service (NFS client panic) via unknown attack vectors related to the use of O_DIRECT (direct I/O).
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9932
https://exchange.xforce.ibmcloud.com/vulnerabilities/25000
http://www.vupen.com/english/advisories/2006/2554
http://www.vupen.com/english/advisories/2006/0804
http://www.securityfocus.com/bid/16922
http://www.redhat.com/support/errata/RHSA-2006-0493.html
http://www.redhat.com/archives/fedora-announce-list/2006-March/msg00003.html
http://www.novell.com/linux/security/advisories/2006-05-31.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/20398
http://secunia.com/advisories/20237
http://secunia.com/advisories/19220
http://secunia.com/advisories/19108