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Microsoft fixes KB5089549 Windows security update install issues
Microsoft has resolved a known issue causing installation failures and 0x800f0922 errors when deploying the May 2026 Windows 11 security update (KB5089549). [...]
🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview
A known issue with insufficient free space on the EFI System Partition (ESP) caused installation failures and 0x800f0922 errors when deploying the May 2026 Windows 11 security update (KB5089549). The issue has been resolved in the Windows 11 KB5089573 preview cumulative update.
⚙️Technical Details
Affected Systems
Devices with limited free space on the EFI System Partition (ESP), especially those with 10 MB or less space available
Attack Vectors
Automatic installation of security updates via Windows Update
💥Impact Assessment
Severity: Medium
Who Is at Risk
Users and devices affected by insufficient ESP free space, including enterprise environments managed by IT departments
🛡️Recommended Actions
1Install the latest update for your device to ensure you have sufficient ESP free space
2Use Known Issue Rollback or manually configure Group Policy to mitigate the issue
3Monitor system logs for 'SpaceCheck' and 'ServicingBootFiles failed' entries
📦Affected Products
Windows 11 versions 25H2 and 24H2
Read the full article
This is a curated summary. The complete article is available at Bleeping Computer.