MC1438566Action Required: Defer Upgrade to Microsoft Defender for Endpoint on Linux Build 101.26052.0009

Updated July 29, 2026: This message is no longer applicable and can be disregarded.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Worldwide, GCC, GCC High, DoD): No longer applicable.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.