Uncontrolled Resource Consumption
An issue was discovered in OpenStack Nova prior to 23.2.2, 24.x before 24.2.0, and 25.x before 25.1.0. By creating a neutron port with the "direct" vnic_type, creating an instance bound to that port, and then changing the vnic_type of the bound port to "macvtap", an authenticated user may cause the compute service to fail to restart, resulting in a possible denial of service. Only Nova deployments configured with SR-IOV are affected.
CWE-400 - Uncontrolled resource consumption
An uncontrolled resource allocation attack (also known as resource exhaustion attack) triggers unauthorized overconsumption of the limited resources in an application, such as memory, file system storage, database connection pool entries, and CPU. This may lead to denial of service for valid users and degradation of the application's functionality as well as that of the host operating system.