hwmon: (pmbus/core) honor vrm_version in pmbus_data2reg_vid() (CVE-2026-72397) | HOL Guard CVE

High · CVSS 7.1CVE-2026-72397

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

Answer in brief

CVE-2026-72397 records a High severity (CVSS 7.1) vulnerability in hwmon: (pmbus/core) honor vrm_version in pmbus_data2reg_vid(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 15, 2026Updated Aug 17, 2026Source checked Sep 29, 2026First seen by HOL Aug 15, 2026Material review Aug 17, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.1
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=068c227056b9223fea1a759e08db2558d5cbb5ad <5bd0d47640395f8a8c34446b62d1781b88869dfa \|\| >=068c227056b9223fea1a759e08db2558d5cbb5ad <828cd614e2af053ca5e1d6da767bbd8a1b5cabfb	5bd0d47640395f8a8c34446b62d1781b88869dfa, 828cd614e2af053ca5e1d6da767bbd8a1b5cabfb
Linux/Linuxgeneric	4.3	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 5bd0d47640395f8a8c34446b62d1781b88869dfa if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 15, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.