Nová zranitelnost procesorů Intel: MMIO (Memory Mapped I/O) Stale Data

Intel zveřejnil informace o nové zranitelnosti MMIO (Memory Mapped I/O) Stale Data ve svých procesorech. Podrobnosti v technické dokumentaci Intelu. V upstreamu Linuxu je již řešeno (processor_mmio_stale_data.rst).

15.6.2022 10:55 | Ladislav Hagara | Bezpečnostní upozornění

Komentáře

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[Finlayunt]

I once wrestled with a production server, its data intermittently corrupted by an unseen force, like a ghostly hand rearranging bytes. The frustration was immense, a true test of my debugging prowess. It felt like I needed to be a Slice Master to untangle the mess, eventually tracing it to a subtle cache coherency issue a silent.

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[Gracie Rhodes]

Thanks for bringing this up—new Intel CPU issues around MMIO “stale data” sound like the kind of thing that can be tricky to spot in real-world systems. I’d expect defenders to validate how their drivers handle memory-mapped I/O and ensure updates are applied promptly. Does anyone know what conditions trigger stale reads most often? Also, curious if kick the buddy is becoming a term people use informally for coordinating mitigations.

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