https://www.bleepingcomputer.com/news/microsoft/windows-7-kb4489878-and-windows-81-kb4489881-released/

The March 2019 patches are also rolling out to PCs with Windows 7 and 8.1. The new monthly rollups for Windows 7 and Windows 8.1 comes with general security fixes and improvements.

In the changelog, Microsoft revealed that the patch for Windows 7 addresses an issue that may prevent the Event Viewer from showing some event descriptions for network interface cards (NIC).