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Microsoft Defender for Endpoint leaves some Linux boxes defenseless after update

ID: e1278abc-f0d9-563b-8d91-7ed96d7d1ff4

STIX ID: report--e1278abc-f0d9-563b-8d91-7ed96d7d1ff4

Feed Name: The Register (Security)

Threat Score
65/100

Date Published: 2026-07-27

Date Updated: 2026-07-27

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Microsoft disclosed two defects in Defender for Endpoint on Linux: an update (101.26042.0000–101.26042.0009) that can disable the Defender service after a reboot and a separate issue that blocks installation on FIPS-enabled RHEL 8 and 9. Affected machines may have received the faulty build via automatic updates; Microsoft identifies fixes in builds 101.26042.0011 and 101.26052.0011.

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