MC1438566 - Action Required: Defer Upgrade to Microsoft Defender for Endpoint on Linux Build 101.26052.0009

Message Center

This announcement expired on Jul 31, 2026 and is no longer active in Message Center.

Summary

The upgrade to Microsoft Defender for Endpoint on Linux build 101.26052.0009 for FIPS-enabled RHEL 8 and 9 devices has been paused due to issues. The message is now outdated and can be disregarded. No action is needed if already upgraded without problems.

Last Updated

Jul 29, 2026

Published Jul 24, 2026

View version history

Service

Microsoft Defender XDR

Tag

Updated message
Admin impact

More information

Updated July 29, 2026: This message is no longer applicable and can be disregarded. We apologize for any inconvenience. 

What and Why:

We have identified an issue affecting Microsoft Defender for Endpoint on Linux build101.26052.0009 on a subset of FIPS-enabled Red Hat Enterprise Linux (RHEL) 8 and RHEL 9 devices. As a precaution, rollout of this build has been paused.

Current Status

We have paused the rollout and are actively working on a revised build. We will provide an update through the Message Center and release notes when the updated package becomes available.

Rollout Schedule:

Worldwide, GCC, GCC High, DoD): No longer applicable.

Impact on your organization:

Impact 

On affected devices, installation or upgrade of the platform package may fail, preventing successful completion of the update process.

Action Required/Recommendations:

What you need to do

  • Do not upgrade to build 101.26052.0009 at this time.
  • Customers who have already upgraded and are not experiencing issues do not need to take immediate action.

Version history

2 versions tracked

Updated 1 time since Jul 24, 2026. Microsoft Message Center only ever shows the current version; this archive preserves the history.

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  1. Jul 29, 2026 · 06:39 PMLatest · v2

    Changed: Body, Tags, End date

  2. Jul 24, 2026 · 09:53 PMOriginal · v1

    Changed: Initial version