---
id: CVE-2026-89892
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  media: em28xx: defer audio-only extension registration

  The audio-only path registers extensions while probing the primary device.
  For a dual-TS board, this happens bef…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  media: em28xx: defer audio-only extension registration

  The audio-only path registers extensions while probing the primary device.
  For a dual-TS board, this happens bef…
severity: medium
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 4a089668ef22c295ed4997289cc48446c849249c <
    0da1e627f4fc9d0e947fdae90913042120878923
  - >-
    Linux >= 4a089668ef22c295ed4997289cc48446c849249c <
    f8d7e77d9c621b42a191c67a9b37bec23dc1d555
  - >-
    Linux >= 4a089668ef22c295ed4997289cc48446c849249c <
    1abe9524dec0fd26e9ceb8d586034d6f68dd8273
  - >-
    Linux >= 4a089668ef22c295ed4997289cc48446c849249c <
    4e11c45dfdc72ab656067b1df8fcebaf52fd4715
  - >-
    Linux >= 4a089668ef22c295ed4997289cc48446c849249c <
    d06067ee32620f272cfb80c7bc7c572ad4e74724
  - >-
    Linux >= 4a089668ef22c295ed4997289cc48446c849249c <
    f9322ac9f862961d7f377b87ec26c8565af7e073
  - >-
    Linux >= 4a089668ef22c295ed4997289cc48446c849249c <
    4666197ca4f7d80cd3b0292054fe45d76be9ba04
  - >-
    Linux >= 4a089668ef22c295ed4997289cc48446c849249c <
    95f76f51937fdfb0fc1e14cae606b1ef574a56f3
  - Linux 4.17
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T11:16:57.870'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89892'
references:
  - url: 'https://git.kernel.org/stable/c/0da1e627f4fc9d0e947fdae90913042120878923'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1abe9524dec0fd26e9ceb8d586034d6f68dd8273'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4666197ca4f7d80cd3b0292054fe45d76be9ba04'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4e11c45dfdc72ab656067b1df8fcebaf52fd4715'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/95f76f51937fdfb0fc1e14cae606b1ef574a56f3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d06067ee32620f272cfb80c7bc7c572ad4e74724'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f8d7e77d9c621b42a191c67a9b37bec23dc1d555'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f9322ac9f862961d7f377b87ec26c8565af7e073'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89892.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89892'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2535230'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89892'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89892'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89892.mbox
  - url: 'https://kernelcve.org/list/?q=CVE-2026-89892'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-09-16T10:53:53.982Z'
epss: 0.00216
epssPercentile: 0.11993
cvss: 5.1
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-416
---

## Overview

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

media: em28xx: defer audio-only extension registration

The audio-only path registers extensions while probing the primary device.
For a dual-TS board, this happens before dev_next is created. The duplicate
device inherits is_audio_only and is then independently inserted into
em28xx_devlist.

The list is intended to contain only primary devices: extension operations
reach the secondary device through dev_next. The independently linked
secondary can be freed during disconnect while its list node remains
reachable, resulting in a use-after-free.

Defer audio-only extension registration to the module-request work item. It
runs only after probing has completed construction of the optional
secondary device, so only the primary is registered and extension callbacks
reach the secondary through dev_next.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 8, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 8, Red Hat OpenShift Container Platform 4 · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89892.json)