Hardware backdoors in some x86 CPUs
Security researchers have identified a hardware backdoor in certain older x86 processors, specifically VIA C3 models, that allows unprivileged code to bypass kernel protections. While the vulnerability is limited to older hardware, it demonstrates a significant risk in deeply embedded CPU architecture.
Why it matters
This discovery highlights potential supply chain and hardware-level security risks that could compromise system integrity at the most fundamental level.
github.com/xoreaxeaxeax/rosenbridge // domas // @xoreaxeaxeax
project:rosenbridge reveals a hardware backdoor in some desktop, laptop, and embedded x86 processors.
The backdoor allows ring 3 (userland) code to circumvent processor protections to freely read and write ring 0 (kernel) data. While the backdoor is typically disabled (requiring ring 0 execution to enable it), we have found that it is enabled by default on some systems.
This repository contains utilities to check if your processor is affected, close the backdoor if it is present, and the research and tools used to discover and analyze the backdoor.
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