What’s Vulnerable › Vulnerabilities

CVE-2025-40065: RISC-V: KVM: Write hgatp register with valid mode bits

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-28 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: RISC-V: KVM: Write hgatp register with valid mode bits According to the RISC-V Privileged Architecture Spec, when MODE=Bare is selected,software must write zero to the remaining fields of hgatp. We have detected the valid mode supported by the HW before, So using a valid mode to detect how many vmid bits are supported.

Affected products

• Linux: 5.16 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux 6.18. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2b351e3d04be9e1533f26c3464f1e44a5beace30
• https://git.kernel.org/stable/c/5cba8ae00279296a586d0596443109d601b1d116
• https://git.kernel.org/stable/c/8b6e327736db013b9e385c3f6f9f0b04ddf26e43
• https://git.kernel.org/stable/c/d00b61cd37f4c183ce0edbc9f8ccf6d5430ea357
• https://git.kernel.org/stable/c/feb64ca53d97b3ac8ba9ecbeae5f9426f1513650

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