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

Do not upgrade to Microsoft Defender for Endpoint on Linux build 101.26052.0009 due to issues on FIPS-enabled RHEL 8 and 9 devices. Rollout is paused; a revised build will be released by late July 2026. Those without issues after upgrading need no immediate action. 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): We will begin rolling out on mid-July 2026 and expect to complete by late July 2026. 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. Message ID: MC1438566

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