Microsoft introduced an Incremental Servicing Model (ISM) is available from the SQL Server team to deliver hotfixes for reported problems.

The SQL Server team is moving away from the current priority-driven hotfix release model to a scheduled delivery model. In the scheduled delivery model, a customer can receive a hotfix to address their most critical situations with a short turn-around time. Additionally, a customer can receive a fix that has undergone more testing and that is released on a schedule basis.

Refer ISM model information.