I need to install System Service Manager 2012 R2 on a SQL 2014 server.

I already have that same SQL Db SCCM 2012R installed.

I want to know if there is already a KB or UK to allow the installation of SCSM 2012R in

   SQL 2014 support for SCSM is not available to date.

   This scenario is only at the announcement state for the upcoming UR6. (two months journey I think)

   Please wait till UR6 for SCSM 2012 R2 is released (not UR6 for SCSM 2012 Sp1).

   Then you will be continue with the scenario above.

SQL 2014 is supported with SCSM 2012 R2 UR6 only. So not possible to install via setup, only way is to upgrade SQL later.