I need to repeat an old advisory: don’t rely on a password to protect your LinkedIn profile from being hacked.
This article I just read postulates what we might use instead of passwords one day soon.
Until that day comes, add two-factor authentication to your LinkedIn password to be sure that every access is really you.
I will refer you to an oldie-but goodie that I wrote here to walk you through this easy process.
Forewarned is forearmed. The battle rages.