Microsoft confirms Windows 11’s May 2026 update is failing to install with error 0x800f0922 and outlines a mitigation for affected PCs
AI-summarised brief · reviewed before publication
Microsoft has confirmed that the May 2026 Security Update for Windows 11 is failing to install on some devices, resulting in error code 0x800f0922. The issue affects systems running versions 24H2 and 25H2 after installing update KB5089549, and occurs on devices with limited free space in the EFI System Partition. The problem typically occurs during the reboot phase of the installation process, around 35 percent complete. Microsoft has mitigated the issue through Known Issue Rollback for consumer and unmanaged business devices, and offers a manual fix for devices that continue to fail. A permanent resolution is being worked on. The issue can be resolved by restarting the computer and checking for updates again.
💡 Why It Matters
- · The error highlights a growing dependence on modern hardware and storage configurations for Windows 11 updates, making older computers and upgraded systems more prone to installation problems.
- · Microsoft's reliance on sufficient free space in the EFI System Partition can lead to hidden issues, even when the computer appears to have ample storage space.