In a first, cryptographic keys protecting SSH connections stolen in new attack
arstechnica.com
An error as small as a single flipped memory bit is all it takes to expose a private key.

I read most of this article trying to determine if I was impacted, so to save you the trouble:

The researchers traced the keys they compromised to devices that used custom, closed-source SSH implementations that didn’t implement the countermeasures found in OpenSSH and other widely used open source code libraries.