December 2014 CU is a full server package – meaning no other update is required to fully patch SharePoint to this level.
Prereq’s: SharePoint 2010 Service Pack 2 should be installed. This CU contains fixes released post SP2.
The KB articles links for December CU:
Full Server Package download links:
Note: SharePoint 2010 Configuration Wizard need to be run on all SharePoint machines after installing the binaries in all machines starting with machine hosting Central Admin.
For Additional information please follow this blog http://blogs.technet.com/b/stefan_gossner/archive/2014/12/09/december-2014-cu-for-sharepoint-2010-has-been-released.aspx by Stefan Gossner