Intel is aware of the issue and will release microcode updates, but as usual there's no telling what performance hit it may entail, and there's also no guarantee older processors will receive any updates.
https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00329.html
https://www.guru3d.com/news-story/new-cacheout-speculative-execution-vulnerability-hits-intel.html
