Intel says Friday's mystery 'security update' microcode isn't a security update
It’s also unclear whether Intel chose not to patch older parts, or if they’re not affected. We’ll note that Microsoft Windows 11 doesn’t support Intel processors older than 8th-gen, so that may be part of the reasoning behind the deployment.
Microcode releases aren’t uncommon, can address and improve all kinds of low-level operations in modern processors, and can include mitigations for chip-level vulnerabilities. However, they’ve become a point of concern for many customers, as these sorts of security fixes can have a severe impact on performance.
In any case, last week’s mystery microcode is already making its way out to Linux users — many distros will apply them as part of their security updates — while we anticipate the release will find its way out to Windows and Mac users before long.
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