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content/_index.md

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date: 07-10-2023
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---
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The GhostWrite vulnerability affects the T-Head XuanTie C910 RISC-V CPU.
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The GhostWrite vulnerability affects the T-Head XuanTie C910 and C920 RISC-V CPUs.
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This vulnerability allows unprivileged attackers, even those with limited access, to read and write any part of the computer's memory and to control peripheral devices like network cards.
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GhostWrite renders the CPU's security features ineffective and cannot be fixed without disabling around half of the CPU's functionality.
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content/homepage/faq.md

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{{< accordion title="Am I affected by this vulnerability?" open=true >}}
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Most likely, you are not affected directly.
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Only individuals that use vulnerable RISC-V hardware, such as C910-based single-board computers (SBCs), cloud deployments, or other multi-party computing solutions are directly affected.
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Only individuals that use vulnerable RISC-V hardware, such as C910-based or C920-based single-board computers (SBCs), cloud deployments, or other multi-party computing solutions are directly affected.
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Even though you might not be affected directly, the chance is high that you might already or in the future interact with vulnerable devices.
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{{< /accordion >}}
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{{< accordion title="How do I know if my device uses the T-Head XuanTie C910 CPU?" >}}
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{{< accordion title="How do I know if my device uses the T-Head XuanTie C910 or C920 CPU?" >}}
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Most consumer devices list their CPU specifications in their technical details or documentation.
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You can check the manufacturer's website, user manual, or device settings for this information.
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{{< /accordion >}}
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{{< accordion title="Does this mean that RISC-V is bad?" >}}
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GhostWrite is not a problem with the RISC-V ISA.
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Only the T-Head XuanTie C910 CPU, an implementation of RISC-V, is vulnerable to GhostWrite due to a bug in it's design.
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Only the T-Head XuanTie C910 and C920 CPUs, implementations of RISC-V, are vulnerable to GhostWrite due to a bug in their design.
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{{< /accordion >}}
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{{< accordion title="Are there any alternative RISC-V CPUs that do not have this vulnerability?" >}}
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Yes, many other RISC-V CPUs are not affected by GhostWrite.
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The vulnerability is specific to the T-Head XuanTie C910 CPU.
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The vulnerability is specific to the T-Head XuanTie C910 and C920 CPUs.
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{{< /accordion >}}
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{{< accordion title="Can I use the logo?" last=true >}}

content/homepage/implications.md

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slug: "implications"
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To the best of our knowledge, only the T-Head XuanTie C910 CPU in the TH1520 SoC is affected by GhostWrite.
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To the best of our knowledge, only the T-Head XuanTie C910 CPU in the TH1520 SoC and the T-Head XuanTie C920 CPU in the SOPHON SG2042 are affected by GhostWrite.
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Still, this vulnerability impacts a wide range of devices, including personal computers, laptops, containers, and virtual machines in cloud servers.
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Therefore, any customers or vendors using machines with these processors are at risk.
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Vulnerable devices include:
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- [Scaleway Elastic Metal RV1](https://labs.scaleway.com/en/em-rv1/), bare-metal C910 cloud instances
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- [Milk-V Pioneer](https://milkv.io/pioneer), 64-core desktop/server
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- [Lichee Cluster 4A](https://sipeed.com/licheepi4a), compute cluster
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- [Lichee Book 4A](https://sipeed.com/licheepi4a), laptop
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- [Lichee Console 4A](https://sipeed.com/licheepi4a), tiny laptop

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