Microsoft released the 5th Cummulative Update for SQL Server 2012 SP2. This update package contains fixes for 27 different issues, distributed as follows:
One very important issue that was fixed on this CU release was KB3038943 – Error 4360 when you restore the backup of secondary replica to another server in AlwaysOn Availability Groups.
If you use SQL Server 2012 SP2 Always On and you offload your log backups to the secondary node it is recommended that you apply this patch!
The full Cummulative Update release and the download links can be found here: https://support.microsoft.com/en-us/kb/3037255/en-us