Based on the information given this type of maintenance is called a maintenance release.
A maintenance release is a release which help to make correction on security issues such as threat or vulnerability without modifying or adding new features to the software.
Maintenance release help to fix or repair programming errors that occur during the software life cycle stage or programming error that occur due to mistake during the requirement stage validating process.
Software that are released often undergo a maintenance release so as detect and fix any error or bug that was detected.
Inconclusion this type of maintenance is called a maintenance release.
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