https://www.bleepingcomputer.com/news/microsoft/microsoft-pulls-a-second-windows-ssu-for-blocking-security-updates/

Microsoft has pulled one more buggy Windows 10 servicing stack update (SSU), KB4601390, because it blocked customers from installing this month's security and Cumulative Updates.

The company resolved the update installation problems by releasing a new servicing stack update (SSU), KB5001079.