The 2nd cumulative update release for SQL Server 2012 Service Pack 1 is now available. Cumulative Update 2 contains all the hotfixes released since the initial release of SQL Server 2012 SP1.
Those who are facing severe issues with their environment, they can plan to test CU2 in test environment & then move to Production after satisfactory results.
To other, I suggest to wait for SP2 final release to deploy on your production environment, to have consolidate build.
KB Article For CU2 of SQL Server 2012 SP1
Previous Cumulative Update KB Articles of SQL Server 2012 SP1
SQL Server 2012 SP1 Cumulative Update #2 has also two new improvements. For more details reference this blog
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Reference : Rohit Garg (http://mssqlfun.com/)