LONDON (Reuters) - Samsung's Galaxy S7 smartphones contain a microchip security flaw, uncovered earlier this year, that put tens of millions of devices at risk to hackers looking to spy on their users, researchers told Reuters.

The Galaxy 7 and other smartphones made by Samsung Electronics were previously thought to be immune to a security vulnerability known as Meltdown, which researchers said affected most of the world's PCs, smartphones and other computing devices.