CVE-2026-72397 hwmon: (pmbus/core) honor vrm_version in pmbus_data2reg_vid()
Incorrect voltage encoding in the Linux kernel PMBus driver can cause hardware to receive wrong voltage commands, potentially leading to hardware damage or instability.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-72397?
CVE-2026-72397 is a high-severity vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-72397?
How do I fix CVE-2026-72397?
Apply the vendor's patch.
Is CVE-2026-72397 being exploited?
There is no known exploitation of CVE-2026-72397 in the wild and no public exploit code.
Sources
Also known as AZL-96290, BELL-CVE-2026-72397, DEBIAN-CVE-2026-72397, GHSA-xrxg-rjqm-5pr4, UBUNTU-CVE-2026-72397.