GoogleAnalysisGoogle Cloud issues security advisory on AMD Turin CPU Transient Scheduler Attacks
What happened.Google Cloud published a security bulletin detailing three processor side-channel vulnerabilities affecting virtual machines running on fifth-generation AMD EPYC Turin processors.
Why it matters.Virtual machine isolation is the core boundary of multi-tenant cloud hosting. When speculative execution flaws allow unprivileged processes to infer kernel memory, application data faces exposure. Cloud infrastructure teams using AMD Turin instances must schedule maintenance windows to complete full stop-start cycles immediately.
The technical specifications:
- Hardware vulnerability: Tracked as Transient Scheduler Attacks, the flaws affect speculative execution routines within AMD fifth-generation EPYC processors.
- Affected instances: The advisory impacts Google Cloud C4D, N4D, H4D, Z4D, and G4 virtual machine series along with bare-metal compute nodes.
- Host mitigations: Google deployed hypervisor updates across all cloud regions to prevent cross-tenant and guest-to-host memory inspection.
- Operator actions: Cloud tenants must apply operating system security packages and execute a complete instance stop-start cycle to activate processor protections.