CVE-2026-31473
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 < 331242998a7ade5c2f65e14988901614629f3db5 | affected |
| Linux | Linux | 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 < 2c685e99efb3b3bd2b78699fba6b1cf321975db0 | affected |
| Linux | Linux | 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 < 585fd9a2063dacce8b2820f675ef23d5d17434c5 | affected |
| Linux | Linux | 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 < 1a0d9083c24fbd5d22f7100f09d11e4d696a5f01 | affected |
| Linux | Linux | 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 < d8549a453d5bdc0a71de66ad47a1106703406a56 | affected |
| Linux | Linux | 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 < 72b9e81e0203f03c40f3adb457f55bd4c8eb112d | affected |
| Linux | Linux | 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 < cf2023e84f0888f96f4b65dc0804e7f3651969c1 | affected |
| Linux | Linux | 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 < bef4f4a88b73e4cc550d25f665b8a9952af22773 | affected |
| Linux | Linux | 4.20 | affected |
| Linux | Linux | 0 < 4.20 | unaffected |
| Linux | Linux | 5.10.253 <= 5.10.* | unaffected |
| Linux | Linux | 5.15.203 <= 5.15.* | unaffected |
| Linux | Linux | 6.1.168 <= 6.1.* | unaffected |
| Linux | Linux | 6.6.131 <= 6.6.* | unaffected |
| Linux | Linux | 6.12.80 <= 6.12.* | unaffected |
| Linux | Linux | 6.18.21 <= 6.18.* | unaffected |
| Linux | Linux | 6.19.11 <= 6.19.* | unaffected |
| Linux | Linux | 7.0 <= * | unaffected |
Weaknesses
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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