---
id: CVE-2026-89725
title: >-
  kernel: media: cec: stm32: prevent out-of-bounds write on RX overflow
  (CVE-2026-89725)
summary: >-
  A flaw was found in the Linux kernel's `media: cec: stm32` driver. A remote
  attacker can exploit an out-of-bounds write vulnerability by sending an
  overlong Consumer Electronics Control (CEC) message without an end-of-message
  signal. This …
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-787
vendor: Red Hat
product: Linux
affected:
  - >-
    Linux >= d69ae57453c80a2193bcdb3fd762efbec447eecf <
    f2499b720ea9b874d58770885c6c2e8445a8c3ef
  - >-
    Linux >= d69ae57453c80a2193bcdb3fd762efbec447eecf <
    3df1a4026662121011187247897fe95fd84e8a3a
  - >-
    Linux >= d69ae57453c80a2193bcdb3fd762efbec447eecf <
    37ac45f7d6e3a6a5dcf6452a0b7bad9a543e8344
  - >-
    Linux >= d69ae57453c80a2193bcdb3fd762efbec447eecf <
    1b4fdefd788db990d1805feb5c7b2388de791ecd
  - >-
    Linux >= d69ae57453c80a2193bcdb3fd762efbec447eecf <
    c3edd7fb8e3692423a702705509947fc9c30b3d1
  - >-
    Linux >= d69ae57453c80a2193bcdb3fd762efbec447eecf <
    0c260d3f97e52978a8c769bb095ac0901333a3ac
  - >-
    Linux >= d69ae57453c80a2193bcdb3fd762efbec447eecf <
    a85ce3b175615c2e13bc01e8a1b6b6b6910fde57
  - >-
    Linux >= d69ae57453c80a2193bcdb3fd762efbec447eecf <
    fb9dda38d4b9e90db07ed9a0ee2d35bf85494035
  - Linux 4.13
published: '2026-09-11'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T20:44:14+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89725.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89725.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89725'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532149'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89725'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89725'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89725.mbox
  - url: 'https://git.kernel.org/stable/c/f2499b720ea9b874d58770885c6c2e8445a8c3ef'
  - url: 'https://git.kernel.org/stable/c/3df1a4026662121011187247897fe95fd84e8a3a'
  - url: 'https://git.kernel.org/stable/c/37ac45f7d6e3a6a5dcf6452a0b7bad9a543e8344'
  - url: 'https://git.kernel.org/stable/c/1b4fdefd788db990d1805feb5c7b2388de791ecd'
  - url: 'https://git.kernel.org/stable/c/c3edd7fb8e3692423a702705509947fc9c30b3d1'
  - url: 'https://git.kernel.org/stable/c/0c260d3f97e52978a8c769bb095ac0901333a3ac'
  - url: 'https://git.kernel.org/stable/c/a85ce3b175615c2e13bc01e8a1b6b6b6910fde57'
  - url: 'https://git.kernel.org/stable/c/fb9dda38d4b9e90db07ed9a0ee2d35bf85494035'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00412
epssPercentile: 0.32765
scores:
  vendor: 5.5
  cna: 8.8
ingestedAt: '2026-09-14T15:23:07.449Z'
---

## Overview

A flaw was found in the Linux kernel's `media: cec: stm32` driver. A remote attacker can exploit an out-of-bounds write vulnerability by sending an overlong Consumer Electronics Control (CEC) message without an end-of-message signal. This causes the driver to write beyond an allocated buffer, potentially leading to arbitrary code execution or a denial of service. The vulnerability can be triggered without local privileges from the Interrupt Request (IRQ) thread.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89725.json)

**kernel: media: cec: stm32: prevent out-of-bounds write on RX overflow** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.

Not affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Refer to the advisory for fix availability.