What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.1 v3.1)
• 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: 2026-08-15 · updated 2026-10-21

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.

Affected products

• Linux kernel: 4.3 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/125a5a4ad03c74ced4c2a55db45ef03505362ff9
• https://git.kernel.org/stable/c/5bd0d47640395f8a8c34446b62d1781b88869dfa
• https://git.kernel.org/stable/c/828cd614e2af053ca5e1d6da767bbd8a1b5cabfb
• https://git.kernel.org/stable/c/cd0e037130806d7714c356eccefac6e1b92dbc34

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