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

CVE-2025-40065 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-40065, released October 28, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-40065
- Priority: High
- CVSS: 7.1 (Important)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 28, 2025
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-40065

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2025-40065](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40065.md) | Oct 28, 2025 |
| Linux | linux Debian 14 | 6.17.6-1 | [DEBIAN-CVE-2025-40065](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40065.md) | Oct 28, 2025 |

---

Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.