Hacker group Antisec has released 1,000,001 pieces of data related to Apple’s UDID identification scheme. This data, if cross-referenced with Apple’s developer resources, could potentially identify a unique user’s geographic location and other specific information. In fact, the database does contain device names (for example, one UDID points to a device name “hobamain” and appeared in a search for the name “Obama”).
This leak is purported to come from a excavation of 12 million UDIDs allegedly hacked from the Dell laptop of Supervisor Special Agent Christopher K. Stangl.
You can read details on the hack here.
You can check to see if your UDID is in the list using this tool.