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EFI ESP space shortfall stalls Windows 11 security update install (KB5089549)

1 min read
Source: BleepingComputer
EFI ESP space shortfall stalls Windows 11 security update install (KB5089549)
Photo: BleepingComputer
TL;DR

Microsoft confirms the May 2026 Windows 11 security update KB5089549 may fail to install on devices with very little free space on the EFI System Partition, typically rolling back at 35–36% with 0x800f0922 errors. Known Issue Rollback is recommended as a workaround, and IT admins can apply a Group Policy-based mitigation in enterprise environments while Microsoft works on a fix.

Topics:technology#efi-system-partition#kb5089549#known-issue-rollback#security-update#technology#windows-11
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  1. Microsoft confirms Windows 11 security update install issues  BleepingComputer
  2. ‘Update Fails To Install’—Microsoft Says Restart Windows  Forbes
  3. Xbox mode is here but this other Windows 11 feature is more exciting  Windows Central
  4. Microsoft Weekly: Long-requested features for Windows 11, leaked gamepads and leaked games  Neowin
  5. Microsoft Releases KB5089593 and KB5089591 WinRE Updates for Windows 11  Windows Report

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