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According to Linux Update, your old Intel processors may be vulnerable to outdated MMIO data

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News Tech: The MMIO Stale Data vulnerabilities were disclosed back in June by Intel. According to the disclosure, vulnerable Intel products include servers and clients running Xeon Scalable Ice Lake or Haswell up to Rocket Lake. Although the Linux kernel has up to this point mistakenly claimed that older CPUs are “not affected” by MMIO Stale Data, it is possible that pre-Haswell Intel CPUs will also be affected.

When an older processor is running, Intel has donated a patch that is now making its way into the mainline kernel to declare it’s “unknown” whether it’s impacted by MMIO Stale Data rather than declaring “not affected” and potentially offering a false sense of security. For their side, Intel only tests/verifies the exposure of vulnerabilities going back a certain amount of time, therefore there isn’t specific information, for instance in the case of MMIO Stale Data, as to whether pre-Haswell CPUs are vulnerable.

The updated Linux documentation for MMIO Stale Data puts the unknown state as: “The processor vulnerability status is unknown because it is out of Servicing period. Mitigation is not attempted.”

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