Cumulative Update 1 includes all hotfixes which were released in SQL Server 2012 SP1 CU 6, 7, 8, and 9.
The build number of the cumulative update package is 12.0.2342.0. You may have to restart the computer after you apply this cumulative update package.
This CU contains 111-121 fixes, depending on your sources.
@AdamMachanic I actually counted the fixes listed in the KB article for the CU, so 114 was my count.—
Glenn Berry (@GlennAlanBerry) April 22, 2014