---
id: CVE-2026-72397
title: 'hwmon: (pmbus/core) honor vrm_version in pmbus_data2reg_vid()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  hwmon: (pmbus/core) honor vrm_version in pmbus_data2reg_vid()

  pmbus_data2reg_vid() hardcoded the VR11 encoding regardless of the
  vrm_version configured by the driver, …
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-681
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 068c227056b9223fea1a759e08db2558d5cbb5ad <
    cd0e037130806d7714c356eccefac6e1b92dbc34
  - >-
    Linux >= 068c227056b9223fea1a759e08db2558d5cbb5ad <
    125a5a4ad03c74ced4c2a55db45ef03505362ff9
  - >-
    Linux >= 068c227056b9223fea1a759e08db2558d5cbb5ad <
    5bd0d47640395f8a8c34446b62d1781b88869dfa
  - >-
    Linux >= 068c227056b9223fea1a759e08db2558d5cbb5ad <
    828cd614e2af053ca5e1d6da767bbd8a1b5cabfb
  - Linux 4.3
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-16T18:48:52.527560Z'
published: '2026-08-15'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:44:48.405Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-72397'
references:
  - url: 'https://git.kernel.org/stable/c/cd0e037130806d7714c356eccefac6e1b92dbc34'
  - url: 'https://git.kernel.org/stable/c/125a5a4ad03c74ced4c2a55db45ef03505362ff9'
  - url: 'https://git.kernel.org/stable/c/5bd0d47640395f8a8c34446b62d1781b88869dfa'
  - url: 'https://git.kernel.org/stable/c/828cd614e2af053ca5e1d6da767bbd8a1b5cabfb'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72397.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-72397'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2516511'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-72397'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-72397'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2026081521-CVE-2026-72397-954f@gregkh/T
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00171
epssPercentile: 0.06435
scores:
  cna: 7.1
  vendor: 5.5
ingestedAt: '2026-10-16T19:46:24.400Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

hwmon: (pmbus/core) honor vrm_version in pmbus_data2reg_vid()

pmbus_data2reg_vid() hardcoded the VR11 encoding regardless of the
vrm_version configured by the driver, while pmbus_reg2data_vid()
already switched on it. Any driver that selects a non-VR11 VID mode
and exposes a regulator (or hwmon vout setter) sent dangerously
wrong codes to PMBUS_VOUT_COMMAND -- e.g. an nvidia195mv part asked
for 200 mV got the VR11 clamp to 500 mV encoded as 0xB2, which the
chip interprets as 1080 mV.

Mirror pmbus_reg2data_vid() so writes round-trip with reads.

## Affected

- `Linux >= 068c227056b9223fea1a759e08db2558d5cbb5ad < cd0e037130806d7714c356eccefac6e1b92dbc34`
- `Linux >= 068c227056b9223fea1a759e08db2558d5cbb5ad < 125a5a4ad03c74ced4c2a55db45ef03505362ff9`
- `Linux >= 068c227056b9223fea1a759e08db2558d5cbb5ad < 5bd0d47640395f8a8c34446b62d1781b88869dfa`
- `Linux >= 068c227056b9223fea1a759e08db2558d5cbb5ad < 828cd614e2af053ca5e1d6da767bbd8a1b5cabfb`
- `Linux 4.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72397.json)