Windows boot partition runs out of space for Microsoft's May security update
Microsoft's May 2026 security update may fail to install due to insufficient space in the EFI System Partition. The update is crucial as it addresses numerous critical vulnerabilities. Affected users can resolve the issue through registry edits or a Known Issue Rollback.
- ▪The May 2026 security update may result in a failure message if the EFI System Partition has 10 MB or less free space.
- ▪Microsoft has acknowledged that the installation might fail during the reboot phase at approximately 35-36% completion.
- ▪The issue affects Windows 11 25H2 and 24H2 versions, occurring after a period of no known issues with Microsoft's operating system.
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