---
id: CVE-2026-89938
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  iio: chemical: atlas-sensor: use iio_trigger_poll_nested() to fix remove UAF

  The atlas driver requests its hardware data-ready IRQ with
  devm_request_threaded_irq(); it…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  iio: chemical: atlas-sensor: use iio_trigger_poll_nested() to fix remove UAF

  The atlas driver requests its hardware data-ready IRQ with
  devm_request_threaded_irq(); it…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 7103b99b031cb0ff6979331757bfc4893f37ae9e <
    f64b437641b5a70c18bb0fd38da2b69d8926c871
  - >-
    Linux >= 7103b99b031cb0ff6979331757bfc4893f37ae9e <
    91e12b0fbd7047d02bf4ef4dbc491b9ef0159250
  - >-
    Linux >= 7103b99b031cb0ff6979331757bfc4893f37ae9e <
    2071624c3d0f497ca91da78858e6f30d7112fea6
  - >-
    Linux >= 7103b99b031cb0ff6979331757bfc4893f37ae9e <
    30b0d44c978bbc857bd68b71dab371805653de70
  - >-
    Linux >= 7103b99b031cb0ff6979331757bfc4893f37ae9e <
    be61c8c6252671ecf1fee0ad90f87669e0be1e20
  - Linux 4.8
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T15:18:19.210'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89938'
references:
  - url: 'https://git.kernel.org/stable/c/2071624c3d0f497ca91da78858e6f30d7112fea6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/30b0d44c978bbc857bd68b71dab371805653de70'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/91e12b0fbd7047d02bf4ef4dbc491b9ef0159250'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/be61c8c6252671ecf1fee0ad90f87669e0be1e20'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f64b437641b5a70c18bb0fd38da2b69d8926c871'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T10:53:53.967Z'
epss: 0.0017
epssPercentile: 0.05579
---

## Overview

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

iio: chemical: atlas-sensor: use iio_trigger_poll_nested() to fix remove UAF

The atlas driver requests its hardware data-ready IRQ with
devm_request_threaded_irq(); its threaded handler queues an irq_work,
atlas_work_handler(), that calls iio_trigger_poll(data->trig).

The IRQ is devm-managed, so free_irq() runs from the devres unwind after
atlas_remove() returns without flushing that irq_work.  Once a buffer is
enabled, conversion-complete IRQs keep firing and queueing it; a pending
irq_work can therefore run after the unwind has freed atlas_data/indio_dev
and the trigger, when atlas_work_handler() derives the atlas_data pointer
via container_of() and dereferences data->trig, a use-after-free.

Call iio_trigger_poll_nested() directly from the threaded handler instead
of bouncing through irq_work.  free_irq() then drains the threaded handler,
closing the window; other iio drivers with a threaded data-ready IRQ do the
same (e.g. bmi270).

This issue was found by an in-house static analysis tool.

## Remediation

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