The mq_open system call in Linux kernel 2.6.9, in certain situations, can decrement a counter twice ("double decrement") as a result of multiple calls to the mntput function when the dentry_open function call fails, which allows local users to cause a denial of service (panic) via unspecified attack vectors.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10731
https://exchange.xforce.ibmcloud.com/vulnerabilities/25302
http://www.securityfocus.com/bid/16283
http://www.securityfocus.com/archive/1/427981/100/0/threaded
http://www.securityfocus.com/archive/1/427980/100/0/threaded
http://www.novell.com/linux/security/advisories/2006_06_kernel.html
http://www.mandriva.com/security/advisories?name=MDKSA-2006:040
http://www.debian.org/security/2006/dsa-1017
http://secunia.com/advisories/19374
http://secunia.com/advisories/19038
http://secunia.com/advisories/18788
http://secunia.com/advisories/18527
http://secunia.com/advisories/18510
http://rhn.redhat.com/errata/RHSA-2006-0101.html
http://lists.suse.de/archive/suse-security-announce/2006-Feb/0010.html