MC1438566: Microsoft Defender for Endpoint on Linux Pauses Rollout of Build 101.26052.0009 Due to Issues on FIPS-Enabled RHEL 8 and 9

2 minutes
MWPRO IMPACT SCORE
OPERATIONAL IMPACT
15
0 25 50 75 100
LOW IMPACT • MONITOR ONLY
Recommended Action:
No immediate action needed. Keep this on your radar.
▶ What is MWPro Impact Score? Watch our 60‑second explainer

Primary Audience

Security TeamsIT ManagersService OwnersTenant AdminsMicrosoft 365 Admins
Why this score?
AI Confidence
HIGH
Enough detail is available to trust this assessment.
Assessment Reasoning
This update was cancelled as the message states it is no longer applicable and can be disregarded. The main impact is awareness and reversing any previous plans to deploy the affected build. There is no immediate user impact and only minor admin review is required to ensure no pending rollouts remain queued.
20
🛡️ Admin Impact
LOW
5
👥 User Impact
LOW
15
⚡ Urgency
LOW
15
🔧 Effort
LOW
ℹ️ WHAT YOU NEED TO KNOW
📌

AT A GLANCE

Issue found in Defender for Endpoint on Linux build 101.26052.0009. Rollout has been paused and this message is now outdated.
👥

END USERS

No major end-user change expected.
🛡️

IT ADMINS

If you blocked upgrades due to this alert, you can now disregard it.
📅

ROLLOUT TIMELINE

Timing:
Not specified

📢 Official Microsoft Message Center Announcement

(Updated) Action Required: Defer Upgrade to Microsoft Defender for Endpoint on Linux Build 101.26052.0009
Message ID: MC1438566 (Updated)

Updated July 29, 2026: This message is no longer applicable and can be disregarded.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Worldwide, GCC, GCC High, DoD): No longer applicable.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

Source: Microsoft Message Center • Analysed by MWPro

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