The answer to 'roof vent leaking' is that a leaking roof vent is a common problem that can be caused by a variety of issues, including improper installation, damaged flashing, or deterioration of the vent itself. Symptoms of a leaking roof vent may include water stains on the ceiling or walls around the vent, mold or mildew growth, and even visible leaks.
In many cases, a leaking roof vent can be repaired by a skilled DIY homeowner. This may involve replacing the flashing, sealing gaps around the vent, or even replacing the vent itself. However, if the issue is more complex or the vent is difficult to access, it's best to call a professional roofing contractor to diagnose and repair the problem.