The Visa I was using for billing with Linode had an authorized "test charge" earlier this week, and I had the card number replaced. Now I see this, and it makes me wonder.
EDIT: All is good with my account.
I wish my CC provider supported 'single use' or 'limit based' generated numbers. I think discover card does?
edit: something like this https://www.discover.com/credit-cards/member-benefits/securi... but for my card would be neat