CVE-2026-89936

/// Technical description

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

iio: dac: m62332: Fix regulator reference count imbalance

m62332_set_value() enables the Vcc regulator on every write of a

non-zero value and disables it on every write of zero, without tracking

the channel's current state. Because the regulator is reference counted,

changing a channel directly from one non-zero value to another enables

it more than once, while a later write of zero disables it only once.

The reference count never returns to zero and the regulator is left

enabled indefinitely.

Only enable the regulator on the transition from zero to non-zero, and

only disable it on the transition from non-zero to zero, using the

previously stored channel value to detect the edge. Balance the

regulator on the I2C error path so the reference count stays consistent

if the write fails.

/// 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