The SQL Server team has released two cumulative updates for SQL Server 2012.

SQL Server 2012 Service Pack 2 Cumulative Update #2

• KB Article: KB #2983175
• Build # is 11.0.5548
• Currently there are 50 public fixes listed (52 total)

 
Relevant for builds 11.0.5058 -> 11.0.5547. Do not attempt to install on SQL Server 2012 RTM (any build < 11.0.3000) or SP1 (any build < 11.0.5058), or any other major version. If you are on a different branch, see this blog post for information on the latest fixes for RTM and Service Pack 1.

SQL Server 2012 Service Pack 1 Cumulative Update #12

• KB Article: KB #2991533
• Build # is 11.0.3470
• Currently there are 14 public fixes listed (16 total)

 
Relevant for builds 11.0.3000 -> 11.0.3469. Do not attempt to install on SQL Server 2012 RTM (any build < 11.0.3000) or SP2 (any build >= 11.0.5058), or any other major version. If you are on a different branch, see this blog post for information on the latest fixes for RTM and Service Pack 2.