The updated IBM Power9 processors intended for mainframes and data centers are potentially vulnerable to abuse of their speculative execution capability. The security defect could allow a local user to access privileged information.
IBM published a security advisory that says, “IBM Power9 processors could allow a local user to obtain sensitive information from the data in the L1 cache under extenuating circumstances.”
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This new vulnerability means these IBM processors need to be flushing their L1 data cache between privilege boundaries, similar to other recent CPU nightmares. The vulnerability reportedly has a base score of 5.1 on the Common Vulnerability Scoring System (CVSS).