Important: microcode_ctl security update (Amazon Linux 2023)

Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2023-23908: Improper access control in some 3rd Generation Intel(R) Xeon(R) Scalable processors may allow a privileged user to potentially enable information disclosure via local access. CVE-2023-23583: An issue was found in redundant REX instruction prefix values affecting third generation Intel Xeon Scalable (?Icelake?) processors. The issue may allow a local third-party actor using such instructions to cause a denial of service (DOS) or achieve privilege escalation. CVE-2023-23583 only affects Amazon Linux customers on EC2 metal platforms. Please refer to the AWS Security Bulletin for more information on the affected instance families and the impacts on AWS services: (https://aws.amazon.com/security/security-bulletins/AWS-2023-013)