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As far as I know, you are able to upgrade kernel to newer one which have it fixed. Even on DigitalOcean.
On day COW was disclosured, DigitalOcean published tutorial with steps needed to protect your Droplet. You can read it in How To Protect Your Server Against the Dirty COW Linux Vulnerability. It have steps for both Ubuntu/Debian and CentOS.
I hope you meant on this, sorry if I misunderstood the question