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.
Affected products
linux: linux kernel
References8
- git.kernel.org/stable/c/1a0d9083c24fbd5d22f7100f09d11e4d696a5f01 Patch
- git.kernel.org/stable/c/2c685e99efb3b3bd2b78699fba6b1cf321975db0 Patch
- git.kernel.org/stable/c/331242998a7ade5c2f65e14988901614629f3db5 Patch
- git.kernel.org/stable/c/585fd9a2063dacce8b2820f675ef23d5d17434c5 Patch
- git.kernel.org/stable/c/72b9e81e0203f03c40f3adb457f55bd4c8eb112d Patch
- git.kernel.org/stable/c/bef4f4a88b73e4cc550d25f665b8a9952af22773 Patch
- git.kernel.org/stable/c/cf2023e84f0888f96f4b65dc0804e7f3651969c1 Patch
- git.kernel.org/stable/c/d8549a453d5bdc0a71de66ad47a1106703406a56 Patch
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 1 · as of 13 November 2026
- CWE
- CWE-416CWE-362
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.