Which of the following is not a part of the ENISA Top 8 Security Risks of cloud computing?

Availability is not considered one of the ENISA Top 8 Security Risks of cloud computing because it is generally viewed as a fundamental quality of service rather than a specific security risk. In cloud security contexts, availability is associated with ensuring that cloud services are accessible to users when needed. It usually forms part of standard service level agreements (SLAs) and is covered by various redundancy and failover strategies implemented by cloud service providers to ensure that services remain operational.

On the other hand, vendor lock-in, isolation failure, and insecure or incomplete data deletion are identified as specific risks due to their implications for security and compliance. Vendor lock-in poses a threat to portability and flexibility, making it difficult for organizations to switch providers without incurring significant costs. Isolation failure entails risks relating to data separation among different tenants in the cloud, which can lead to unauthorized access. Insecure or incomplete data deletion raises concerns about data privacy and security when sensitive information is unintentionally recoverable after deletion processes are implemented. Thus, while availability is crucial for overall cloud service reliability, it does not fall under the specific top security risks highlighted by ENISA.