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This is according to a new report from Quarkslab, who detailed the flaws, and a proof-of-concept solution.
As the environment is often dubbed Pixieboot, the researchers named the vulnerability PixieFail.
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Arm, AMI, Insyde, Phoenix Technologies, andMicrosoft, were all said to be vulnerable to PixieFail.
AMI, for example, has released a patch, while Microsoft is currently taking appropriate action.
Other manufacturers, including Arm, Insyde, and Phoenix, are yet to make a statement.