---
id: CVE-2026-31473
title: 'media: mc, v4l2: serialize REINIT and REQBUFS with req_queue_mutex'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  media: mc, v4l2: serialize REINIT and REQBUFS with req_queue_mutex

  MEDIA_REQUEST_IOC_REINIT can run concurrently with VIDIOC_REQBUFS(0)
  queue teardown paths. This can …
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'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 <
    331242998a7ade5c2f65e14988901614629f3db5
  - >-
    Linux >= 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 <
    2c685e99efb3b3bd2b78699fba6b1cf321975db0
  - >-
    Linux >= 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 <
    585fd9a2063dacce8b2820f675ef23d5d17434c5
  - >-
    Linux >= 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 <
    1a0d9083c24fbd5d22f7100f09d11e4d696a5f01
  - >-
    Linux >= 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 <
    d8549a453d5bdc0a71de66ad47a1106703406a56
  - >-
    Linux >= 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 <
    72b9e81e0203f03c40f3adb457f55bd4c8eb112d
  - >-
    Linux >= 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 <
    cf2023e84f0888f96f4b65dc0804e7f3651969c1
  - >-
    Linux >= 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 <
    bef4f4a88b73e4cc550d25f665b8a9952af22773
  - Linux 4.20
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:09:53.356132Z'
published: '2026-04-22'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:20:12.372Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-31473'
references:
  - url: 'https://git.kernel.org/stable/c/331242998a7ade5c2f65e14988901614629f3db5'
  - url: 'https://git.kernel.org/stable/c/2c685e99efb3b3bd2b78699fba6b1cf321975db0'
  - url: 'https://git.kernel.org/stable/c/585fd9a2063dacce8b2820f675ef23d5d17434c5'
  - url: 'https://git.kernel.org/stable/c/1a0d9083c24fbd5d22f7100f09d11e4d696a5f01'
  - url: 'https://git.kernel.org/stable/c/d8549a453d5bdc0a71de66ad47a1106703406a56'
  - url: 'https://git.kernel.org/stable/c/72b9e81e0203f03c40f3adb457f55bd4c8eb112d'
  - url: 'https://git.kernel.org/stable/c/cf2023e84f0888f96f4b65dc0804e7f3651969c1'
  - url: 'https://git.kernel.org/stable/c/bef4f4a88b73e4cc550d25f665b8a9952af22773'
tags:
  - cve.org
epss: 0.00171
epssPercentile: 0.06044
ingestedAt: '2026-10-16T17:24:46.656Z'
---

## Overview

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

media: mc, v4l2: serialize REINIT and REQBUFS with req_queue_mutex

MEDIA_REQUEST_IOC_REINIT can run concurrently with VIDIOC_REQBUFS(0)
queue teardown paths. This can race request object cleanup against vb2
queue cancellation and lead to use-after-free reports.

We already serialize request queueing against STREAMON/OFF with
req_queue_mutex. Extend that serialization to REQBUFS, and also take
the same mutex in media_request_ioctl_reinit() so REINIT is in the
same exclusion domain.

This keeps request cleanup and queue cancellation from running in
parallel for request-capable devices.

## Affected

- `Linux >= 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 < 331242998a7ade5c2f65e14988901614629f3db5`
- `Linux >= 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 < 2c685e99efb3b3bd2b78699fba6b1cf321975db0`
- `Linux >= 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 < 585fd9a2063dacce8b2820f675ef23d5d17434c5`
- `Linux >= 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 < 1a0d9083c24fbd5d22f7100f09d11e4d696a5f01`
- `Linux >= 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 < d8549a453d5bdc0a71de66ad47a1106703406a56`
- `Linux >= 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 < 72b9e81e0203f03c40f3adb457f55bd4c8eb112d`
- `Linux >= 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 < cf2023e84f0888f96f4b65dc0804e7f3651969c1`
- `Linux >= 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 < bef4f4a88b73e4cc550d25f665b8a9952af22773`
- `Linux 4.20`

## Remediation

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