Microsoft's January 13, 2026 security update KB5073455 has caused a shutdown bug impacting Windows 11 Enterprise and IoT editions. Users find their systems unwilling to power off, instead hibernating or restarting unexpectedly.
Security Feature and Affected Versions
The issue only affects systems with System Guard Secure Launch enabled, a security feature that prevents firmware-level threats during boot. Notably, Windows 11 Home and Pro editions are free from this issue. The bug arises during ACPI power-state transitions, interpreting shutdown commands erroneously.
Temporary Solution and Recommendations
A temporary solution involves executing the command shutdown /s /t 0 in an elevated Command Prompt, which forces immediate shutdown without prompts. Microsoft advises against using hibernation until the problem is resolved, as no workaround currently exists for that function.
Resolution Efforts and Next Steps
Microsoft is actively addressing the bug, promising a future update to fix this issue. In the interim, enterprise IT administrators should consider halting the KB5073455 rollout on unaffected devices to prevent disruption.
