LVM for AIX 5.1 and 5.2 allows local users to overwrite arbitrary files via a symlink attack.
https://exchange.xforce.ibmcloud.com/vulnerabilities/16011
http://www.securityfocus.com/bid/10230
http://www.ciac.org/ciac/bulletins/o-131.shtml
http://www-1.ibm.com/services/continuity/recover1.nsf/mss/MSS-OAR-E01-2004.0544.2