--- title: "Microsoft confirms Windows 11 security update install issues" url: https://daily.dev/posts/microsoft-confirms-windows-11-security-update-install-issues-k06ltyksv source_url: https://www.bleepingcomputer.com/news/microsoft/microsoft-confirms-kb5089549-windows-11-security-update-install-issues type: article source: "BleepingComputer" published: 2026-05-18T08:33:36.208Z updated: 2026-08-24T07:01:40.672Z tags: ["microsoft", "windows"] reading_time: 3 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Microsoft confirms Windows 11 security update install issues **[BleepingComputer](https://daily.dev/sources/bleepingcomputer)** · 3 min read · 0 upvotes · 0 comments ## Summary Microsoft has confirmed a known issue with the May 2026 Windows 11 security update (KB5089549) that causes installation failures with 0x800f0922 errors. The root cause is insufficient free space on the EFI System Partition (ESP), particularly on devices with 10 MB or less available. Affected systems fail during the reboot phase at around 35–36% completion and automatically roll back. Microsoft recommends using the Known Issue Rollback feature for consumer devices, while enterprise admins can deploy a specific Group Policy to mitigate the issue until a permanent fix is released. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Microsoft fixes KB5089549 Windows security update install issues](https://daily.dev/posts/microsoft-fixes-kb5089549-windows-security-update-install-issues-q5rwtymau) · BleepingComputer · 0 upvotes · 0 comments - [Microsoft May security patch fails for some due to boot partition size glitch](https://daily.dev/posts/microsoft-may-security-patch-fails-for-some-due-to-boot-partition-size-glitch-sapotcf7h) · CSO Online · 0 upvotes · 0 comments - [Microsoft fixes Windows Server 2016 security update failures](https://daily.dev/posts/microsoft-fixes-windows-server-2016-security-update-failures-lopdlm8gq) · BleepingComputer · 0 upvotes · 0 comments - [Microsoft: April Windows Server 2025 update may fail to install](https://daily.dev/posts/microsoft-april-windows-server-2025-update-may-fail-to-install-wup1wkdhj) · BleepingComputer · 0 upvotes · 0 comments --- Tags: [#microsoft](https://daily.dev/tags/microsoft), [#windows](https://daily.dev/tags/windows) [View this post on daily.dev](https://daily.dev/posts/microsoft-confirms-windows-11-security-update-install-issues-k06ltyksv)