The 6th cumulative update release for SQL Server 2012 Service Pack 1 is now available. Cumulative Update 6 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 CU6 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 CU6 of SQL Server 2012 SP1
§ CU#6 KB Article: http://support.microsoft.com/kb/2874879
Previous Cumulative Update KB Articles of SQL Server 2012 SP1
§ CU#5 KB Article: http://support.microsoft.com/kb/2861107
§ CU#4 KB Article: http://support.microsoft.com/kb/2833645
§ CU#3 KB Article: http://support.microsoft.com/kb/2812412
§ CU#2 KB Article: http://support.microsoft.com/kb/2790947
§ CU#1 KB Article: http://support.microsoft.com/kb/2765331
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Reference : Rohit Garg (http://mssqlfun.com/)