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Windows 11 update installation fix (KB5089573)

Security Patch Release
First reported
Last updated
Happening score
H score 14
1 unique sources, 1 articles

Summary

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Microsoft resolved the Windows 11 KB5089549 installation failure with KB5089573, fixing update rollbacks on devices with limited EFI System Partition (ESP) space. The affected update could fail with 0x800f0922 and undo changes during reboot. Systems on May 26, 2026 and later updates no longer need the workaround.

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Timeline

  1. 01.06.2026 13:59 2 articles · 1mo ago

    Microsoft releases KB5089573 preview cumulative update for Windows 11

    Mitigation Patch Update

    Microsoft released the KB5089573 preview cumulative update for Windows 11 versions 25H2 and 24H2, providing the fix for KB5089549 installation failures caused by insufficient EFI System Partition (ESP) free space and including performance and reliability improvements.

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  2. 01.06.2026 13:59 1 articles · 1mo ago

    Microsoft details KB5089549 install failures on low-space EFI partitions

    Technical Analysis Update

    Microsoft said the May 2026 Windows 11 security update KB5089549 can fail on devices with limited EFI System Partition (ESP) free space, especially when 10 MB or less is available, causing 0x800f0922 errors and automatic rollback during reboot at roughly 35–36% completion. Microsoft also pointed to SpaceCheck and ServicingBootFiles failed log entries, and said Known Issue Rollback and Group Policy mitigation can be used until KB5089573 or later is installed.

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