Microsoft confirms Windows 11 security update install issues
ID: f732d1d0-2248-5099-847c-acb67bb656cd
STIX ID: report--f732d1d0-2248-5099-847c-acb67bb656cd
Feed Name: Bleeping Computer
Threat Score
Microsoft confirmed that the May 2026 Windows 11 cumulative update (KB5089549) can fail to install and roll back on systems with very limited EFI System Partition (ESP) free space (about 10 MB or less), producing error 0x800f0922 and log entries noting insufficient ESP space; Microsoft recommends using Known Issue Rollback or applying a Group Policy mitigation and restarting devices while it works on a fix.
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