CVE-2026-74549

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

hwmon: (nct6775-core) Prevent access to unsupported weight registers

Sashiko reports:

During initialization of the nct6116 chip, the driver sets data->pwm_num

to 5. However, it assigns several NCT6106 register arrays (such as

NCT6106_REG_WEIGHT_DUTY_STEP, NCT6106_REG_WEIGHT_TEMP_SEL, and

NCT6106_REG_WEIGHT_TEMP_*) to data->REG_PWM and data->REG_WEIGHT_TEMP.

These arrays only contain 3 elements.

In nct6775_update_pwm(), the driver iterates up to data->pwm_num. If

data->has_pwm has bits 3 or 4 set (which is structurally possible for

nct6116), the loop attempts to read elements at index 3 and 4 from these

3-element arrays. This results in a global out-of-bounds read, which can

be caught by KASAN.

Furthermore, the driver uses these garbage out-of-bounds values as

hardware register addresses for subsequent read and write operations. This

leads to invalid hardware register access, potentially causing hardware

misconfigu

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References