AMD Zen Systems Vulnerability in Linux Kernel

CVE-2023-53438

What is CVE-2023-53438?

A vulnerability has been identified in the Linux kernel pertaining to AMD Zen-based systems. The Instruction Fetch (IF) units in these systems do not reliably ensure that synchronous machine check (#MC) exceptions are reported for errors related to poison consumption. This shortfall, due to an incomplete status update (MCG_STATUS) for error contexts, can inadvertently lead the kernel to assume that errors occurred in kernel space, which might trigger unnecessary kernel panics. A patch has been implemented to address this by ensuring that the Code Segment (CS) register is saved whenever a poison consumption error arises from the IF unit, thus improving diagnostic clarity without compromising system stability.

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