Security Update news

Microsoft's May security update for Windows 11 is failing for some users, leaving their systems unprotected. The installation fails and rolls back when the device's boot partition has insufficient free space. The issue occurs during the reboot phase, leaving dozens of security patches uninstalled.

Microsoft has officially acknowledged that the May 2026 Windows 11 security update, KB5089549, is failing to install on some devices. Affected users are reporting an error code 0x800f0922, which prevents the update from completing. The company is currently investigating the issue.