Multiple security vulnerabilities were discovered in the Linux kernel for Google Cloud Platform (linux-gcp-6.17), including a critical flaw named EntrySign affecting some AMD Zen processors. EntrySign involves improper verification of CPU microcode signatures, allowing a privileged attacker to load malicious microcode, potentially compromising system integrity and confidentiality. Additionally, numerous other vulnerabilities affect a wide range of kernel subsystems and drivers. These issues could allow attackers to compromise affected systems. Fixes have been released and are available in updated linux-gcp kernel packages.