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Microsoft Windows Known Issue Rollback guidance for KB5089549

Advisory/Mitigation
First reported
Last updated
Happening score
H score 14
1 unique sources, 1 articles

Summary

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Microsoft's Known Issue Rollback guidance gives Windows 11 users and admins a workaround for KB5089549 installation failures caused by low EFI System Partition (ESP) space. Affected devices could hit 0x800f0922 errors and roll back near 35–36% completion, and Group Policy can mitigate the issue in enterprise environments. Microsoft also said KB5089573 and later remove the need for the workaround.

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Timeline

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

    KB5089573 preview update resolves Windows 11 KB5089549 installation failures

    Mitigation Patch Update

    Microsoft released the KB5089573 preview cumulative update for Windows 11 versions 25H2 and 24H2 on Wednesday, May 26, 2026, and said it resolved the KB5089549 installation-failure issue that could trigger 0x800f0922 errors and rollback behavior on devices with limited EFI System Partition free space.

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

    Microsoft advises Known Issue Rollback for Windows 11 KB5089549 failures

    Initial Disclosure

    Microsoft said the KB5089549 installation-failure issue can be mitigated with Known Issue Rollback for affected Windows 11 devices, and that enterprise admins can also deploy a Group Policy workaround until they install KB5089573 or a later update.

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