Windows 11 / Intelligence workspace
Snapshot · 2026-10-25
IssuesKB5089549Evidence
Windows update intelligence

May 2026 security update fails to install with 0x800f0922

Some devices failed to install the May 2026 security update due to insufficient free space on the EFI System Partition.

ResolvedC3 · Microsoft confirmedMajor impactSnapshot checked 2026-10-25

Does this match your environment?

Windows scope
24H2 / 25H2
Architecture
Unknown — not universal
App / driver
Windows Update / EFI System Partition
Conditions
Devices with insufficient EFI System Partition free space; the error code is 0x800f0922.

A matching version is only a starting point. This page does not diagnose an individual device.

Evidence & current resolution

Microsoft lists this scope as resolved on 2026-05-26. Resolving update: KB5089573.

Microsoft official evidence
Evidence ID
official-esp-install-failure
Source groups
1 · official publication
Evidence basis
Manually reviewed public source; no independent device test
Evidence permalink

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Recorded timeline

2026-05-12

Originating update released

KB5089549
2026-05-26

Official resolution recorded

KB5089573

2026-10-25

Snapshot reviewed

Added to this curated collection. Earlier acknowledgement time was not independently captured.

Follow official guidance for your environment. We do not provide automatic rollback or security-disable actions.