KB2836751 describes this new Update Rollup and contains installation instructions as well.
For OM12 SP1 nine issues are fixed, among them one of the most annoying bugs ever and present since SCOM 2007 RTM. When some one uses the Operator Role in SCOM/OM12, tons of EventID 26319 are generated in the OpsMgr event log of the SCOM/OM12 Management Server running that session.
Many years ago I filed it as a bug. It got confirmed and then closed without being fixed. However, the annoyance didn’t go away. Simply because it makes the event logs noisy, filled with crappy CRITICAL events because of a bug. So this Update Rollup removes this clutter from the event logs.
For monitoring UNIX/Linux systems, 3 issues have been fixed.
Want to know more? Read KB2836751. It contains all the information you need, download links included.
When you want to download these files separately from the Microsoft Update Catalog, go here (select only the appropriate files).