Intel 20230808 Microcode Published For DOWNFALL, Other Security & Functional Issues

Written by Michael Larabel in Intel on 8 August 2023 at 02:33 PM EDT. 1 Comment
In addition to the Linux kernel patches for GDS/Downfall for reporting the mitigated state and handling around Intel's latest speculative execution vulnerability, the updated CPU microcode has now been published on GitHub. In addition to having the Downfall mitigations for Skylake through Icelake/Tigerlake, there are also other security updates and functional issues resolved by this Intel 20230808 CPU microcode release.

First and foremost this updated Intel CPU microcode has the mitigations needed for the rather nasty Downfall security vulnerability that was disclosed this Patch Tuesday. I already have benchmarks in the works and initial results should be out in a matter of hours.

In addition to Downfall (INTEL-SA-00828), there is also a fix in this microcode for INTEL-SA-00836 that affects 3rd Gen Xeon Scalable processors with an information disclosure issue. That carries a medium CVSS rating and requires local access with a privileged user. There is also INTEL-SA-00837 as a security vulnerability rated with a 7.2 "High" CVSS score around Intel SGX that could allow escalation of privilege.

In addition to the three security fixes, there are also unspecified updates for functional issues. Functional issues have been resolved from 13th Gen Core "Raptor Lake" and older as well as 3rd Gen Xeon Scalable and older. In the end with today's microcode update are revisions for all platforms from Skylake and newer
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Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via

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