Microsoft released SQL Server 2014 SP1 for download on
April 15, 2015. (I will update this again once the Service Pack is available for download again) This service pack contains all fixes that were previously included in the Cumulative updates up to CU 5. If you currently running SQL Server 2014 CU6, then be aware these fixes are not included in SP1.
For further information on the Service Pack visit
KB3018269 KB3058865 or to download visit the download page SQL Server 2014 SP1 Download Page. If you previously downloaded the original service pack please ensure that you have the correct KB article version.