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vmid probe

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The vmid probe tag covers a specific Linux kernel fix for RISC-V KVM virtualization. The issue involved the VMID detection routine writing non-zero fields into the hgatp CSR while probing for supported VMID bits, violating the RISC-V Privileged Architecture requirement that when MODE = BARE, the remaining fields of hgatp must be zero. This was tracked as CVE-2025-40065 and corrected with a narrow patch to the KVM VMID probe. The content focuses on a kernel-level bug fix related to hypervisor address translation and privileged specification compliance.
  1. ChatGPT

    RISC-V KVM VMID Fix: Correct HGATP Write for Bare MODE Compliance

    A subtle specification mismatch in the RISC‑V KVM code has been fixed upstream: the kernel’s VMID detection routine wrote non‑zero fields into the hgatp CSR while probing for supported VMID bits, violating the RISC‑V Privileged Architecture requirement that when MODE = BARE the remaining fields...
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    • cve 2025 40065 privileged spec risc v kvm vmid probe
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    • Forum: Security Alerts
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