Every OS with Linux kernel 3.8 or above is affected. A new zero-day Linux kernel vulnerability has been identified (CVE-2016-0728) by a group named Perception Point, and a patch should already be in preparation for Linux distributions.
Linux kernel vulnerabilities are not all that uncommon, and they are found and patched all the time. This is why the Linux-based operating systems are usually more secure than proprietary ones. Everything gets fixed as soon as it’s found, and not a minute later. On the other hand, zero-day vulnerabilities are not all that frequent, especially for the Linux kernel.
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