Citiraj:
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AMD recommends customers apply a µcode patch or BIOS update as applicable for products based on “Zen 3” and “Zen 4” CPU architectures. No µcode patch or BIOS update is necessary for products based on “Zen” or “Zen 2” CPU architectures because these architectures are already designed to flush branch type predictions from the branch predictor. It sounds like they have been working on this for some time as the Windows patch went live last month.
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Citiraj:
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The new Downfall vulnerability is a big one. This impacts Intel’s desktop CPUs up to Alder Lake and Intel’s server CPUs up to Ice Lake, the generation that was still top-of-the-line on the first day of 2023. Found by Daniel Moghimi, now at Google, the vulnerability targets AVX2 and AVX-512 pipelines in what Intel is calling a Gather Data Sampling (GDS) attack. Intel and Daniel have been working for some time on this before its disclosure today. Intel and its firmware and OS partners have been coordinating a microcode update that will mitigate the vulnerability.
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AMD Ryzen 9 9950X | Noctua NH-U12A chromax.black | MSI MAG B650 Tomahawk Wi-Fi | 128GB Kingston FURY Beast DDR5-5200 | 256GB AData SX8200 Pro NVMe | 2x4TB WD Red Plus | Fractal Define 7 Compact | Seasonic GX-750
AMD Ryzen 5 7600 | Noctua NH-U12A chromax.black | MSI MAG B650 Tomahawk Wi-Fi | 128GB Kingston FURY Beast DDR5-5200 | 256GB AData SX8200 Pro NVMe | 2x12TB WD Red Plus | Fractal Define 7 Compact | eVGA 650 B5
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