Windows May Security Updates Fail Due to EFI Partition Space Issues

Source:Heise Online

02 — Who / Subject

Microsoft

03 — Where / Locus

Global

04 — When / Temporality

May 18, 2026

Verified: May 18, 2026

05 — Why / Core Summary

"Windows 11 May security updates are failing with error code 0x800f0922. The issue is caused by insufficient free space (10MB or less) in the EFI system partition. Microsoft suggests registry modifications or Known Issue Rollback (KIR) as workarounds."

Conflict Analysis

2 sources have verified this fact, increasing its reliability.

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Windows Internals, Part 1: System architecture, processes, threads, memory management, and more

Author: Pavel Yosifovich, Mark E. Russinovich, David A. Solomon

This book is the definitive guide to the Windows architecture. Understanding how the OS manages partitions, boot processes, and system updates is essential to grasping why EFI capacity constraints cause update failures.

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