---
id: CVE-2026-89900
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  media: cec: core: Fix kmemleak due to missed rc_free_device() call

  The commit dccc0c3ddf8f ("media: rc: fix race between unregister and
  urb/irq callbacks") removed the…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  media: cec: core: Fix kmemleak due to missed rc_free_device() call

  The commit dccc0c3ddf8f ("media: rc: fix race between unregister and
  urb/irq callbacks") removed the…
severity: medium
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= a7becb58f6b8a3a3efe5d3acfd52e2c107de6772 <
    954ee95a03b4d31d4505591bfaba02c24b75776b
  - >-
    Linux >= 75977f5f5c4974c72bbedefbf09ad33ebbaa36f1 <
    f28a8e1ba4d67a18e4662e5acefd5a4389322366
  - >-
    Linux >= e250b672d40a9e0d97a8895cbb301248bea0fce6 <
    695063fc57574dd117b1bc750ca189cf03a2caad
  - >-
    Linux >= dccc0c3ddf8f16071736f98a7d6dd46a2d43e037 <
    cca2407794795cecff7f8e5f5a79f4ef6b1d6f6c
  - >-
    Linux >= dccc0c3ddf8f16071736f98a7d6dd46a2d43e037 <
    a24ba0653f7154e671dc8d2bf64682ab2d042792
  - Linux >= 6.6.143 < 6.6.157
  - Linux >= 6.12.93 < 6.12.110
  - Linux >= 6.18.35 < 6.18.51
  - Linux 7.1
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T11:16:58.880'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89900'
references:
  - url: 'https://git.kernel.org/stable/c/695063fc57574dd117b1bc750ca189cf03a2caad'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/954ee95a03b4d31d4505591bfaba02c24b75776b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a24ba0653f7154e671dc8d2bf64682ab2d042792'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cca2407794795cecff7f8e5f5a79f4ef6b1d6f6c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f28a8e1ba4d67a18e4662e5acefd5a4389322366'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89900.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89900'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2535242'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89900'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89900'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89900.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-09-16T10:53:53.978Z'
epss: 0.002
epssPercentile: 0.08782
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-772
---

## Overview

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

media: cec: core: Fix kmemleak due to missed rc_free_device() call

The commit dccc0c3ddf8f ("media: rc: fix race between unregister and
urb/irq callbacks") removed the implicit call to rc_free_device() from
rc_unregister_device(). However, the commit missed to remove the NULL
assignment of adap->rc that is now causing rc_free_device() to never be
called on an allocated rc device.

kmemleak reports following after e.g. dw-hdmi unbind:

unreferenced object 0xffff00010ac10000 (size 4096):
  comm "kworker/u16:1", pid 39, jiffies 4294897739
  hex dump (first 32 bytes):
    20 23 4b 0a 01 00 ff ff 08 00 c1 0a 01 00 ff ff   #K.............
    08 00 c1 0a 01 00 ff ff 00 00 00 00 00 00 00 00  ................
  backtrace (crc e11baccc):
    kmemleak_alloc+0x38/0x44
    __kmalloc_cache_noprof+0x4a8/0x5e0
    rc_allocate_device+0x48/0x2a0
    cec_allocate_adapter+0x3ac/0x800
    dw_hdmi_cec_probe+0x264/0x634
    platform_probe+0xc0/0x188
    really_probe+0x4a4/0x8e0
    __driver_probe_device+0x2f8/0x440
    driver_probe_device+0x60/0x160
    __device_attach_driver+0x1a0/0x2a0
    bus_for_each_drv+0x100/0x1a0
    __device_attach+0x174/0x350
    device_initial_probe+0x90/0xb0
    bus_probe_device+0x4c/0x120
    device_add+0xdec/0x116c
    platform_device_add+0x354/0x598

Remove the assignment of adap->rc to NULL to let cec_delete_adapter()
free the allocated rc device after last user of the cec device exits to
fix the kmemleak.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-09-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89900.json)