Microsoft has released Cumulative Update #5 for SQL Server 2012 RTM. Note this is *not* a cumulative update for Service Pack 1. So if your build # is >= 11.0.3000, you should not be installing this update.
Looking for an update for the Service Pack 1 branch? You'll find that in January. For now at least, unlike the SQL Server 2008 R2 SP1/SP2 branches (which are in sync), the release cycles for SQL Server 2012 CUs will alternate – RTM one month, SP1 the next. This is mainly due to the out-of-band release of SP1 CU1 to get it caught up the the RTM CUs.
This update is only relevant for builds 11.0.2100 -> 11.0.3329. Do not attempt to install on SQL Server 2012 SP1 (any build >= 11.0.3000) or any previous version of SQL Server.