Agile: How to handle Bugs in Scrum

There are 3 types of bugs:

1. Bugs created in current sprint because story that was suppose to be done introduce bug and whole story cannot be accepted by product owner.
2. Bugs that was created in the past, but appear in the current sprint. This bugs make end user (customer) unable to accomplish something with software. Support team is unable to resolve problem without going to dev team for code change.
3. Bugs that are well known or appear in the current sprint. This bugs are defect to the software that create small discomfort for end user (customer).

First and second, should be fixed in 24 hours by scrum team. Otherwise Product Owner with Development Team need to re-evaluate sprint goal. Third one should go to the backlog, be estimated as normal story and prioritized by product owner.

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