Spectre and Meltdown exploits are under development.
AMD has, like Intel, announced that its next generation of chips will not be burdened with either Meltdown or Spectre. Patching efforts continue (Bleeping Computer). The vulnerabilities apparently haven't so far been exposed to exploits designed to take advantage of it, but one can't count on that forever. Malware exploiting the CPU vulnerabilities is expected to break into the wild in the near future (Bleeping Computer).
Researchers have observed more than one-hundred-thirty distinct samples of malicious code designed to attack these flaws. The security firms studying the activity—including AV-TEST, Fortinet and Minerva Labs—have concluded these aren't mere proofs-of-concept. Instead, researchers believe they're observing experimentation with new attack tools. The developers appear to be using proof-of-concept code released shortly after the vulnerabilities were disclosed, following the familiar post-disclosure path to weaponization (Computing).