amd ryzen 3 4300u firmware vulnerabilities and exploits

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A GPU kernel can read sensitive data from another GPU kernel (even from another user or app) through an optimized GPU memory region called _local memory_ on various architectures.

1 Article

Failure to validate the AMD SMM communication buffer may allow an malicious user to corrupt the SMRAM potentially leading to arbitrary code execution.

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Improper access control in System Management Mode (SMM) may allow an malicious user to write to SPI ROM potentially leading to arbitrary code execution.

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When SMT is enabled, certain AMD processors may speculatively execute instructions using a target from the sibling thread after an SMT mode switch potentially resulting in information disclosure.

1 Article

IBPB may not prevent return branch predictions from being specified by pre-IBPB branch targets leading to a potential information disclosure.

Aliases in the branch predictor may cause some AMD processors to predict the wrong branch type potentially leading to information disclosure.

2 Articles

Mis-trained branch predictions for return instructions may allow arbitrary speculative code execution under certain microarchitecture-dependent conditions.

1 Article

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