not just in France
most(all?) EU have laws which limit how much you can opt out of liability _no matter what you write into a contract_
while I'm not sure about the exact boundaries per country but I'm pretty sure that at least all hospitals, emergency call services etc. can sue for a non-negligible part of the damages that outage caused directly
private people which where harmed by not getting operations done in time most likely can also sue them for the full damages caused to them (through it's hard to assess the damages and it might need to be indirectly by suing the hospital and the hospital sues for more damages)
what you likely will not be able to sue for is the lost opportunity cost, the man power needed to fix it etc.
also my guess is that for a lot of cases which are not as sever as human damages or as indirect as lost opportunity cost a huge factor will depend on the degree of negligence judges believe happened. And here "negligence" isn't limited to the specific change which caused the bug but also if they kept they due diligence in choices of tooling, approaches, business processes etc. to reasonable minimize the risk. (like e.g. was their way of parsing configs inadequate/did it follow industry best practices (IMHO it doesn't seem so), or was it adequate to mark the driver as required to allow boot (else windows would have auto disabled it and then restarted) etc.)