When you’re managing any Windows Server 2012 or Windows 8 system with System Center 2012 (SP1), like monitoring it with SCOM 2012 (SP1), or SCVMM 2012 (SP1) or DPM 2012 (SP1) you’ll need to install a hotfix in order to repair a handle leak in WMI.
KB2790831 tells it all and offers the hotfix for download as well. As the same KB describes this handle leak: ‘…This issue occurs because, when Performance Data Helper log files are opened, Pdh.dll creates a new thread by using the CreateThread() API to process the log files. The CreateThread() API then returns a handle to the newly created thread. The handle remains open after these log files are closed, causing a handle leak…’