Microsoft fixes KB5089549 Windows security update install issues

Microsoft has resolved a known issue causing installation failures and 0x800f0922 errors when deploying the May 2026 Windows 11 security update (KB5089549).

As Microsoft explained when it acknowledged the issue two weeks ago, these failures are caused by insufficient free space on the EFI System Partition (ESP), which results in the update automatically rolling back on impacted devices.

Users affected by these installation problems see a “Something didn’t go as planned. Undoing changes.” message when the update rolls back, and may also find “SpaceCheck” and “ServicingBootFiles failed” log entries pointing to insufficient ESP free space.

Read more: bleepingcomputer.com

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