Earlier this week, information emerged a couple of Windows replace breaking dual-boot methods with Windows and Linux put in side-by-side. Now, Microsoft has formally stated the issue and promised to analyze and fasten it.

A notification posted within the legit Windows documentation showed that putting in the August 2024 Patch Tuesday updates leads to the next error message when making an attempt to release Linux on a dual-boot machine:

Verifying shim SBAT knowledge failed: Security Policy Violation. Something has long gone severely fallacious: SBAT self-check failed: Security Policy Violation.

The supply of this downside is a Secure Boot Advanced Targeting (SBAT) atmosphere for blockading previous and prone boot managers. It used to be now not supposed to land on dual-boot methods, however because it on occasion occurs on the earth of Microsoft, it by some means did. The corporate says that came about on account of failed dual-boot detection:

This SBAT replace might not be implemented to gadgets the place twin booting is detected. On some gadgets, the dual-boot detection didn’t stumble on some custom designed strategies of dual-booting and implemented the SBAT price when it must now not had been implemented.

As a brief workaround, Microsoft suggests consumers with dual-boot Windows-Linux methods now not restart their Windows copies to use the August 2024 Patch Tuesday replace and use a definite registry key to dam the replace:

Workaround: If you haven’t finalized the set up of the August 2024 replace with a reboot but, you’ll be able to use the beneath opt-out registry key, so your instrument doesn’t set up this replace. You will have the ability to delete the registry key if you wish to set up long run SBAT updates in a while.

reg upload HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlSecureBootSBAT /v OptOut /d 1 /t REG_DWORD

There could also be a discussion board thread about SBAT revocation that assist you to repair an already damaged machine.

The downside impacts all supported consumer and server editions of Windows 10 and 11, from Windows Server 2012 and Windows 10 2015 LTSB the entire means as much as Windows 11 model 23H2 and Windows Server 2022.