Performance impact observed On AMD Zen based systems after Red Hat Enterprise Linux upgrade due to Speculative Return Stack Overflow (SRSO aka INCEPTION) CVE-2023-20569 vulnerability fix

Solution Verified - Updated -

Issue

Upgrading from a RHEL kernel without SRSO (CVE-2023-20569 aka INCEPTION) updated packages to a kernel that does support SRSO updated packages may result in a performance impact. It has been observed on AMD Zen, generations 1-4. That is all families 0x17 and 0x19. Older processors have not been investigated.

This can happen when upgrading from older 8.x, or 9.x kernels without SRSO vulnerability updated packages to a newer RHEL kernel with SRSO vulnerability updated packages.

Environment

  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • AMD Zen microarchitecture, generations 1-4

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