If a vulnerability is used to jailbreak an iPhone or iPad, is that vulnerability typically closed/fixed as part of the jailbreak (itself, or a recommended next step) ?
In other words: if a new release of iOS fixes a security hole, then can the user have that hole fixed on his device while keeping an older version of iOS (jailbreaked)? Or is it a choice: either the pros of jailbreak (but with a known vulnerability) or no vulnerability (and newer iOS), but no jailbreak?