A vulnerability identified as EntrySign (CVE-2024-36347) affects some AMD Zen processors where CPU microcode signatures are not properly verified. This flaw allows a privileged attacker to potentially load malicious CPU microcode, leading to loss of system integrity and confidentiality. Additionally, multiple security issues in the Linux kernel affecting numerous subsystems have been addressed. These kernel vulnerabilities could allow attackers to compromise affected systems. The issues are fixed in updated Linux kernel packages for linux-aws-fips, linux-fips, and linux-gcp-fips, available with Ubuntu Pro.