What risks do a stolen private key mean to the rest of a BIP39 Ethereum keychain?

Assume a properly seeded BIP39 key chain of Ethereum keys. The private key belonging to one (only one) of the Ethereum addresses becomes compromised by an attacker.

Scenario A: the attacker doesn't know anything else.

Scenario B: the attacker knows some of the other addresses (but only the addresses).

In each scenario, how endangered is the master private key or other private keys in the key chain?

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A long time ago there was a discussion about this in Bitcoin, and the take-away was (if my memory is not too foggy) that the leaking of one private key makes it easier to guess the master private key. I wonder if this is the case for Ethereum BIP39 key chains as well.

Submitted November 26, 2018 at 07:09PM }
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