MC1462918 Medium
Microsoft Windows Autopatch: September 2026 Windows security update requires a restart for hotpatch-enabled devices
Summary AI-generated
The September 2026 Windows security update will require a restart for all devices, including those enrolled in hotpatching, as some improvements cannot be updated without it.
Suggested actions AI-generated
- Inform affected users about required restart after September 2026 update.
- Review maintenance windows and restart policies.
- Monitor update deployment and compliance.
- Track hotpatch update calendars.
Written by Azure OpenAI (gpt-4.1) from the text of the post below. It can be incomplete or wrong; the original post is authoritative.
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Original post from Microsoft
[What and why]
The September 2026 Windows security update will be released as a standard update rather than a hotpatch update. Some of the security improvements in this update change components that cannot be updated without a restart. As a result, devices enrolled in hotpatching will need to restart to complete installation.
[Rollout schedule]
- September 2026: Standard update with restart required for all devices including those that are hotpatch-enabled.
- October 2026: Planned baseline update month with restart required.
- November 2026: Next hotpatch update expected.
[Impact on your organization]
Who is affected
- Organizations using Windows Autopatch with hotpatch-enabled devices
- Users of devices currently enrolled in hotpatch updates
Platforms and services
- Windows Autopatch
- Windows 11 hotpatch
- Windows Server hotpatch
What will happen
- Hotpatch-enabled devices will require a restart to complete installation of the September 2026 security update.
- Hotpatch-enabled devices will remain enrolled in hotpatch updates.
- Devices not using hotpatch updates are unaffected because standard Windows security updates already require a restart.
- No changes are being made to hotpatch enrollment or configuration requirements.
[Action required / recommendations]
No action is required.
We recommend that administrators:
- Inform affected users that a restart will be required following installation of the September 2026 security update.
- Review maintenance windows and device restart policies to help ensure timely installation.
- Continue monitoring update deployment and compliance through existing management tools.
- Track the hotpatch update calendars on the Windows release health site for both Windows 11 and Windows Server.
Learn more
- Windows 11 hotpatch calendar - Windows 11 release information | Release health | Windows | Microsoft Learn
- Windows Server hotpatch calendar - Windows Server release information | Windows Search release information | Windows | Microsoft Learn
[Compliance considerations]
No compliance action is required. Update installation and restart behavior will be reflected in update history and compliance reports as usual.
Additional details from Microsoft
- Summary
- The September 2026 Windows security update requires a restart for hotpatch-enabled devices because it is a standard update. Devices will remain enrolled in hotpatching, with no changes to enrollment. Administrators should inform users, review restart policies, and monitor updates; no action or compliance changes are needed.