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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.

Related Happenings

Windows 11 update installation fix (KB5089573)

Security Patch Release
First: 01.06.2026 13:59 Last: 01.06.2026 13:59 Sources 1

How related: "This issue was resolved by Windows updates released May 26, 2026 (KB5089573), and later. We recommend you install the latest update for your device as it contains important improvements and issue resolutions, including this one,"

About this happening: **Microsoft** resolved the **Windows 11 KB5089549** installation failure with **KB5089573**, fixing update rollbacks on devices with limited **EFI System Partition (ESP)** space....

Open Happening

Microsoft Windows Update restricted-network download failure

Service Disruption
First: 19.05.2026 14:22 Last: 19.05.2026 14:22 Sources 1

About this happening: Microsoft's **Windows Update** is failing in **restricted network environments** after the **January 2026 optional non-security preview updates**, leaving affected systems unable...

Open Happening

Microsoft Windows 11 KB5089549 cumulative update

Security Patch Release
First: 18.05.2026 11:33 Last: 18.05.2026 11:33 Sources 1

About this happening: 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 nearl...

Open Happening

Windows 11 25H2 BitLocker recovery fix (KB5089549)

Security Patch Release
First: 13.05.2026 18:42 Last: 13.05.2026 18:42 Sources 1

About this happening: Microsoft shipped **KB5089549** for **Windows 11 25H2** to fix a **BitLocker Recovery** problem that could trap devices after the **April 2026 security updates**. The issue involv...

Open Happening

Microsoft Windows Autopatch fix for EU restricted driver update deployment bug

Security Tool/Service
First: 13.05.2026 17:36 Last: 13.05.2026 17:36 Sources 1

About this happening: **Microsoft** fixed a **Windows Autopatch** service bug that let **restricted driver updates** reach some managed devices in the **EU**, bypassing admin approval controls and crea...

Open Happening

Timeline

  1. 01.06.2026 13:59 1 articles · 6h 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 · 6h 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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