CVE-2025-40065
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BaseFortify

Publication date: 2025-10-28

Last updated on: 2025-10-30

Assigner: kernel.org

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.
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Meta Information
Published
2025-10-28
Last Modified
2025-10-30
Generated
2026-06-16
AI Q&A
2025-10-28
EPSS Evaluated
2026-06-15
NVD
CVE-2025-40065
Affected Vendors & Products
Currently, no data is known.
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability involves the Linux kernel's handling of the hgatp register in the RISC-V KVM (Kernel-based Virtual Machine). According to the RISC-V Privileged Architecture Specification, when the MODE field is set to Bare, software must write zero to the remaining fields of the hgatp register. The vulnerability arises because the system previously detected the valid mode supported by the hardware and used a valid mode to determine how many VMID bits are supported, which does not comply with the specification.

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