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Vulnerability record · CVE-2026-31473 · published 22 April 2026

CVE-2026-31473: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.17% · top 94.2% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-31473), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.