---
id: CVE-2026-89936
title: |-
  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 writ…
summary: |-
  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 writ…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= b87b0c0f81e8d11c881b726b886b7502ab67d884 <
    bac0ed8bee651aa841375edf72c6ab1d10ac80c6
  - >-
    Linux >= b87b0c0f81e8d11c881b726b886b7502ab67d884 <
    9263b9ad968a563337a60e0eb66e35186e1faf9a
  - >-
    Linux >= b87b0c0f81e8d11c881b726b886b7502ab67d884 <
    1d3a7d7dd3adee19e00be2b2237140f0fe169484
  - >-
    Linux >= b87b0c0f81e8d11c881b726b886b7502ab67d884 <
    f5acb824277a97a5210c454872202bf7f08c75d4
  - >-
    Linux >= b87b0c0f81e8d11c881b726b886b7502ab67d884 <
    ae18d2d2ef27a4d04fda6e30c23774513dc9be1e
  - >-
    Linux >= b87b0c0f81e8d11c881b726b886b7502ab67d884 <
    08ac8d2976d57aa943d64e351c4d0bd8bb0c6de9
  - >-
    Linux >= b87b0c0f81e8d11c881b726b886b7502ab67d884 <
    9fe22f563b2a0fdb11fd3711a8c39c023629c08a
  - >-
    Linux >= b87b0c0f81e8d11c881b726b886b7502ab67d884 <
    a130404ce0b69ca1438126bd81c1985d3b4d2e6f
  - Linux 4.2
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T11:17:03.027'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89936'
references:
  - url: 'https://git.kernel.org/stable/c/08ac8d2976d57aa943d64e351c4d0bd8bb0c6de9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1d3a7d7dd3adee19e00be2b2237140f0fe169484'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9263b9ad968a563337a60e0eb66e35186e1faf9a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9fe22f563b2a0fdb11fd3711a8c39c023629c08a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a130404ce0b69ca1438126bd81c1985d3b4d2e6f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ae18d2d2ef27a4d04fda6e30c23774513dc9be1e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bac0ed8bee651aa841375edf72c6ab1d10ac80c6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f5acb824277a97a5210c454872202bf7f08c75d4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T10:53:53.967Z'
epss: 0.00211
epssPercentile: 0.11621
---

## Overview

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

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.