OS SecurityBleeping Computer
4.0 — MEDIUM
Microsoft confirms Windows 11 security update install issues
Microsoft has confirmed that the May 2026 Windows 11 security update (KB5089549) fails to install on some systems and triggers 0x800f0922 errors. [...]
🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview
A known issue with the May 2026 Windows 11 security update (KB5089549) causes installation problems on systems with limited free space on the EFI System Partition (ESP), resulting in automatic rollback and error messages.
⚙️Technical Details
💥Impact Assessment
Severity: Medium
🛡️Recommended Actions
1Check and ensure sufficient free space on the EFI System Partition (ESP)
2Use the Known Issue Rollback feature to mitigate the issue
3Configure Group Policy to resolve the issue in enterprise-managed environments
📦Affected Products
Windows 11
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