Microsoft has released a crucial update, KB5089573, for Windows 11 versions 25H2 and 24H2. The update addresses significant installation failures that occurred after the May 2026 Patch Tuesday updates.
Key Details of the Update
This latest cumulative update brings the OS builds to 26200.8524 and 26100.8524. It resolves a prevalent issue where the installation of the May 2026 Patch Tuesday update, identified as KB5089549, failed on certain devices. The error, marked by code 0x800f0922, primarily impacted systems with limited space on the EFI System Partition (ESP), especially those with 10 MB or less available.
During the update process, affected systems encountered a crash during the reboot phase, around 35–36% completion. This left many devices in an unstable state. Previously, Microsoft had issued a Known Issue Rollback (KIR) as a short-term solution, while a registry-based workaround was made available for enterprise administrators.
Comprehensive Fixes and Enhancements
Released on May 26, 2026, KB5089573 provides a permanent solution, removing the need for any temporary workarounds. This update is part of a two-phase rollout, involving a gradual and then broad deployment, which aims to improve stability and enhance user experience.
Alongside resolving the ESP issue, KB5089573 updates several AI components, including Image Search, Content Extraction, and Semantic Analysis, to version 1.2605.856.0. These updates reflect Microsoft’s ongoing effort to enhance AI functionalities within Windows 11. Additionally, personalization improvements were introduced on May 28, 2026, during the gradual rollout stage.
Installation and Availability
The update is readily accessible through Windows Update, with no prerequisites other than having a compatible Windows 11 25H2 or 24H2 device. Users can navigate to Start → Settings → Windows Update → Advanced options → Optional updates to download and install the update. Alternatively, it can be downloaded directly from the Microsoft Update Catalog.
For enterprise environments, deployment can occur via Windows Update for Business or WSUS. At the time of release, no known issues with KB5089573 have been reported by Microsoft. However, should uninstallation be necessary, Microsoft recommends using the DISM /online /get-packages command to identify the package name, followed by DISM/Remove-Package.
It is important to note that using the Windows Update Standalone Installer (wusa.exe) with the /uninstall switch is ineffective because the package includes a Servicing Stack Update (SSU), which cannot be removed post-installation. Given the critical nature of the ESP issue, both IT administrators and end users are encouraged to prioritize this update during their next scheduled maintenance period.
