Microsoft Resolves Installation Issues with KB 5089549 Security Update
Microsoft Resolves Installation Issues with Windows Security Update KB5089549
In early June 2026, Microsoft identified and addressed a critical issue affecting the deployment of the May 2026 Windows 11 security update (KB5089549).
According to Microsoft, this issue primarily impacted devices with minimal EFSP space, specifically those with 10 MB or less available storage.
The update would frequently fail to install due to a lack of sufficient free space on the Essential File System Partition (EFSP), resulting in automatic rollback and a corresponding error code, 0x800f0922.
- Users encountering this issue reported seeing a generic error message indicating that something did not go as planned, along with specific log entries highlighting the space-related issue.
- Affected systems could initially appear to progress through the update process but would ultimately fail around the 35-36% mark during the reboot phase.
To resolve this, Microsoft released the Windows 11 KB5089573 preview cumulative update on May 26, 2026, containing the necessary fix.
- Devices running the May 26, 2026, or later cumulative update do not require any workarounds for this issue.
- For users utilizing earlier updates and experiencing this problem, Microsoft recommends applying the latest update or implementing a Known Issue Rollback to reverse the faulty update.
- Administrators in managed enterprise environments can configure Group Policies to manually mitigate this issue.
The resolution of this issue aligns with Microsoft’s ongoing efforts to enhance the stability and functionality of its operating system.
The company continues to prioritize addressing potential vulnerabilities and ensuring seamless user experiences.
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