The kernel in Apple OS X before 10.10.2 does not properly validate IODataQueue object metadata fields, which allows attackers to execute arbitrary code in a privileged context via a crafted app.
https://exchange.xforce.ibmcloud.com/vulnerabilities/100516
http://www.securitytracker.com/id/1031650
http://support.apple.com/HT204244
http://lists.apple.com/archives/security-announce/2015/Jan/msg00003.html