Emma Benoit

The issue is related to the implementation of the Indirect Branch Prediction Barrier (IBPB) mechanism in AMD processor microcode, which may lead to a potential information disclosure due to incorrect clearing of the Return Address Stack (RAS). This could allow an attacker to obtain sensitive information using a side channel. The vulnerability is being actively exploited.

The issue is related to the LFENCE/JMP module in AMD CPUs, specifically concerning the branch prediction mechanism. This allows an attacker to access protected memory from a program without the necessary privileges by exploiting indirect branch prediction.