Git: How to sync multiple topic branches that emerged from master with new master
This question already has an answer here:
Git: How to rebase many branches (with the same base commit) at once?
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I think the answer @DavidM linked to is not applicable to your situation, because it shows how to rebase a number of branches at once, and your topic branches are already on the remote, so you can’t rebase them at will.
I don’t think you’ll do any better than to simply merge
master back in to each topic branch. That will bring the “hotfix” onto all the topic branches, and create new merge commits (so the history will show what you did). If you don’t like the merge commits, just
cherry-pick the “hotfix” onto each topic branch instead.