Available at: http://support.microsoft.com/kb/2790831/en-us
This hotfix addresses an issue found in Windows Server 2012 (and Win8) that can be exposed when performance data is queried via WMI. Products that regularly query WMI for performance data are SCOM, SCVMM, and SCDPM. Since ConfigMgr also depends on WMI so heavily, you might consider this for Win8 clients if you detect the handle leak issue.
I have updated my hotfix list for SCOM with this information: