The I2O Utility Filter driver (i2omgmt.sys) 5.1.2600.2180 for Microsoft Windows XP sets Everyone/Write permissions for the "\\.\I2OExc" device interface, which allows local users to gain privileges. NOTE: this issue can be leveraged to overwrite arbitrary memory and execute code via an IOCTL call with a crafted DeviceObject pointer.
https://exchange.xforce.ibmcloud.com/vulnerabilities/42358
http://www.vupen.com/english/advisories/2008/1476/references