Medium [CVE-2026-72397] (pmbus/core) honor vrm_version in pmbus_data2reg_vid
This medium-severity Red Hat Linux advisory covers CVE-2026-72397 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
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Summary
A flaw was found in the Linux kernel's `hwmon` subsystem, specifically within the `pmbus/core` module. The `pmbus_data2reg_vid()` function incorrectly hardcoded the VR11 encoding, disregarding the `vrm_version` configured by the driver.
This issue could lead to drivers sending dangerously wrong voltage codes to the Power Management Bus (PMBus) `VOUT_COMMAND`, potentially causing hardware instability or damage due to incorrect voltage regulation. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-681. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: kernel-rt.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 3 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 3 hours ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 3 hours ago·verify at source
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