Security Vulnerability In VIOS, AIX, And Maybe IBM i

November 23, 2020 Timothy Prickett Morgan

IBM i shops that use the Virtual I/O Server, which is a cut-down version of the AIX implementation of Unix created by Big Blue, have to be aware that there is a security vulnerability that affects recent releases of AIX and VIOS.

The vulnerability, announced in Security Vulnerability CVE-2020-4788, affects Power9 machinery running VIOS 3.1 or AIX 7.1 and AIX 7.2, and under what are called “extenuating circumstances” the vulnerability could allow a local user on the system to obtain sensitive information stored on the L1 cache on the Power9 cores.

The vulnerability was reported on November 18, and …