Microsoft Fixes Windows 11 Update That Broke Dual-Boot Linux Systems
The update was meant to add new Secure Boot Advanced Targeting (SBAT) protections to block outdated and probable vulnerable bootloaders by checking the Secure Boot DBX, a database of blacklisted UEFI executables. However, Microsoft says the update did not always correctly detect customized dual-boot setups. As a result, some users saw their Linux systems fail to start, receiving a 'Verifying shim SBAT data failed: Security Policy Violation' error.
Microsoft responded a few days later with a workaround that required users to change system policies and edit the Windows Registry. The company explained that the SBAT update should not have been applied to devices with dual-boot configurations, but the detection process missed some customized setups and incorrectly enforced the new security settings.
Earlier this week, Microsoft released a fix as part of the May 2025 Patch Tuesday update, KB5058405. The update corrects the SBAT detection logic, restoring Linux boot functionality for affected users.
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