Do we have such treaties, can you point me at one of them? IIRC nuclear reactors have been explicitly targeted (https://en.wikipedia.org/wiki/Vulnerability_of_nuclear_plant...) and would be so in the future; although common sense states that both parties would want to avoid a Chernobyl-like event in their battlezone.
Furthermore, this would be a perfect example where a "digital Geneva convention" would not be needed; you'd want a treaty expressing mutual agreement that everyone understands that destruction of such facilities is not in anyone's best interest, and everyone agrees not to do it in principle - without any reference to specific means of destruction; the same principles should apply for digital attacks as for bombing or insider sabotage.
The Geneva convention Protocol I states that facilities like nuclear reactors "may be attacked but only in ways that do not threaten to release the dangerous forces", and that seems a perfectly valid description - there is no blanket prohibition to attack them, you are explicitly allowed to bomb or sabotage the nuclear plant in a way that disables it but not in a way that causes a meltdown; so you'd be also allowed to hack it in a way that disables it but not in a way that causes a meltdown.
Furthermore, this would be a perfect example where a "digital Geneva convention" would not be needed; you'd want a treaty expressing mutual agreement that everyone understands that destruction of such facilities is not in anyone's best interest, and everyone agrees not to do it in principle - without any reference to specific means of destruction; the same principles should apply for digital attacks as for bombing or insider sabotage.
The Geneva convention Protocol I states that facilities like nuclear reactors "may be attacked but only in ways that do not threaten to release the dangerous forces", and that seems a perfectly valid description - there is no blanket prohibition to attack them, you are explicitly allowed to bomb or sabotage the nuclear plant in a way that disables it but not in a way that causes a meltdown; so you'd be also allowed to hack it in a way that disables it but not in a way that causes a meltdown.