CVE-2026-31473
media: mc, v4l2: serialize REINIT and REQBUFS with req_queue_mutex
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.
INFO
Published Date :
April 22, 2026, 2:16 p.m.
Last Modified :
April 22, 2026, 2:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Apply kernel updates with serialization fixes.
- Ensure req_queue_mutex protects REINIT and REQBUFS.
- Prevent concurrent request cleanup and queue cancellation.
References to Advisories, Solutions, and Tools
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information, practical solutions, and valuable tools related to
CVE-2026-31473.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-31473 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-31473
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following table lists the changes that have been made to the
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Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 22, 2026
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/1a0d9083c24fbd5d22f7100f09d11e4d696a5f01 Added Reference https://git.kernel.org/stable/c/2c685e99efb3b3bd2b78699fba6b1cf321975db0 Added Reference https://git.kernel.org/stable/c/331242998a7ade5c2f65e14988901614629f3db5 Added Reference https://git.kernel.org/stable/c/585fd9a2063dacce8b2820f675ef23d5d17434c5 Added Reference https://git.kernel.org/stable/c/72b9e81e0203f03c40f3adb457f55bd4c8eb112d Added Reference https://git.kernel.org/stable/c/bef4f4a88b73e4cc550d25f665b8a9952af22773 Added Reference https://git.kernel.org/stable/c/cf2023e84f0888f96f4b65dc0804e7f3651969c1 Added Reference https://git.kernel.org/stable/c/d8549a453d5bdc0a71de66ad47a1106703406a56