Microsoft Windows 11 KB5089549 cumulative update
Security Patch Release
Summary
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Microsoft's KB5089549 Windows 11 security update is failing to install on some systems, forcing affected devices to roll back during reboot. The problem is tied to a nearly full EFI System Partition (ESP) and can surface as 0x800f0922, creating update failure risk for devices with 10 MB or less free space. Microsoft is advising Known Issue Rollback and a Group Policy mitigation while it works on a fix.
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Timeline
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18.05.2026 11:33 2 articles · 9d ago
Microsoft confirms KB5089549 Windows 11 install rollback issue
Initial DisclosureMicrosoft confirmed that the Windows 11 security update KB5089549 can fail to install on devices with 10 MB or less free space on the EFI System Partition (ESP), triggering 0x800f0922 errors and an automatic rollback during the reboot phase; affected devices may show the "Something didn't go as planned. Undoing changes." message, and Microsoft recommends Known Issue Rollback or a Group Policy mitigation for managed environments.
Show sources
- Microsoft confirms Windows 11 security update install issues — www.bleepingcomputer.com — 18.05.2026 11:33
- Microsoft confirms Windows 11 security update install issues — www.bleepingcomputer.com — 18.05.2026 11:33