SB20260815320 - Improper input validation in Linux kernel hwmon pmbus driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-72397)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to send incorrect voltage commands to a PMBus device.

The vulnerability exists due to improper input validation in pmbus_data2reg_vid() in the pmbus core when converting user-supplied voltage values for PMBUS_VOUT_COMMAND. A local user can request a voltage using a non-VR11 VID mode to send incorrect voltage commands to a PMBus device.

Only drivers that select a non-VR11 VID mode and expose a regulator or hwmon vout setter are affected.

Remediation

Install update from vendor's website.

References

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