For those Dynamics customers on SQL Server 2012 Service Pack 1 or above, Cumulative Update 7 is released http://support.microsoft.com/kb/2894115.
There are 2 memory leaks that have been patched that impact Dynamics AX:
Dynamics AX uses these features. I've personally seen this at customers with AX 2009 and AX2012.
You can run the following query to monitor for the issue:
select type, sum(pages_in_bytes)/1024.0/1024.00 'Mem in MB', count (*) 'row count' from sys.dm_os_memory_objects where type like '%MEMOBJ_COMPILE_ADHOC%'
group by type
For those of you on Service Pack 1, please consider my previous blog: http://blogs.msdn.com/b/axinthefield/archive/2013/10/31/sql-server-2012-service-pack-1-issue-that-could-crash-your-server.aspx
So, please plan on patching your SQL servers at your earliest opportunity.