By Joseph Ofonagoro
Publication Date: 2026-05-19 16:41:00
Microsoft’s latest update is failing at the one job it cannot afford to get wrong: installing.
Several Windows users have reported that the Patch Tuesday update, KB5089549, fails to install on systems with nearly full EFI System Partitions, resulting in error code 0x800f0922. The issue occurs mid-install and triggers an automatic rollback, leaving affected devices unpatched.
Microsoft has acknowledged the issue and rolled out a Known Issue Rollback (KIR) to address the problematic experience. Even so, the episode points to a familiar Windows problem where updates keep failing due to minor issues.
A Windows update with rough edges
On May 12, Microsoft released KB5089549 as part of its mandatory monthly cumulative update for Windows. While the update rolled out with necessary security patches and other feature additions, it has, however, not been without problems. Reports have emerged that, mid-update, many users are shown 0x800f0922 errors halting the process.
Confirming its…
