---
id: CVE-2026-89462
title: 'power: supply: max17040: propagate register read errors'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  power: supply: max17040: propagate register read errors

  max17040_get_vcell() and max17040_get_soc() ignore errors returned by
  regmap_read().  When an I2C transfer fail…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-908
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= c6f4a42de60b981dd210de01cd3e575835e3158e <
    bcdcbef9c5e69a1e79c6b9f6a3434da2f68724ed
  - >-
    Linux >= c6f4a42de60b981dd210de01cd3e575835e3158e <
    2943a0edd4865ed744702ada647921c3981207f6
  - >-
    Linux >= c6f4a42de60b981dd210de01cd3e575835e3158e <
    13fb0477da9b400071b9d518b24d6434c4965263
  - >-
    Linux >= c6f4a42de60b981dd210de01cd3e575835e3158e <
    c7aa4c3708cc0d8487336f8281665eaea87130f6
  - >-
    Linux >= c6f4a42de60b981dd210de01cd3e575835e3158e <
    659cc3d8d5ef246263873fce72c8cadeeed073cc
  - Linux 2.6.31
published: '2026-09-11'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:47:31.845Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89462'
references:
  - url: 'https://git.kernel.org/stable/c/bcdcbef9c5e69a1e79c6b9f6a3434da2f68724ed'
  - url: 'https://git.kernel.org/stable/c/2943a0edd4865ed744702ada647921c3981207f6'
  - url: 'https://git.kernel.org/stable/c/13fb0477da9b400071b9d518b24d6434c4965263'
  - url: 'https://git.kernel.org/stable/c/c7aa4c3708cc0d8487336f8281665eaea87130f6'
  - url: 'https://git.kernel.org/stable/c/659cc3d8d5ef246263873fce72c8cadeeed073cc'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89462.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89462'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532447'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89462'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89462'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89462.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00168
epssPercentile: 0.06151
ingestedAt: '2026-09-14T00:35:28.530Z'
---

## Overview

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

power: supply: max17040: propagate register read errors

max17040_get_vcell() and max17040_get_soc() ignore errors returned by
regmap_read().  When an I2C transfer fails, the uninitialized register
value is converted and reported to userspace as a valid voltage or state
of charge.  The polling worker can also replace the cached state of charge
with the bogus value and emit a spurious change event.

Propagate read errors through the power supply get_property callback and
keep the last valid cached state of charge when polling fails.

## Affected

- `Linux >= c6f4a42de60b981dd210de01cd3e575835e3158e < bcdcbef9c5e69a1e79c6b9f6a3434da2f68724ed`
- `Linux >= c6f4a42de60b981dd210de01cd3e575835e3158e < 2943a0edd4865ed744702ada647921c3981207f6`
- `Linux >= c6f4a42de60b981dd210de01cd3e575835e3158e < 13fb0477da9b400071b9d518b24d6434c4965263`
- `Linux >= c6f4a42de60b981dd210de01cd3e575835e3158e < c7aa4c3708cc0d8487336f8281665eaea87130f6`
- `Linux >= c6f4a42de60b981dd210de01cd3e575835e3158e < 659cc3d8d5ef246263873fce72c8cadeeed073cc`
- `Linux 2.6.31`

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89462.json)