CVE-2026-31473 (GCVE-0-2026-31473)
Vulnerability from cvelistv5
Published
2026-04-22 13:54
Modified
2026-04-27 14:03
Severity ?
7.8 (High) - 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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 6093d3002eabd7c2913d97f1d1f4ce34b072acf9
Version: 6093d3002eabd7c2913d97f1d1f4ce34b072acf9
Version: 6093d3002eabd7c2913d97f1d1f4ce34b072acf9
Version: 6093d3002eabd7c2913d97f1d1f4ce34b072acf9
Version: 6093d3002eabd7c2913d97f1d1f4ce34b072acf9
Version: 6093d3002eabd7c2913d97f1d1f4ce34b072acf9
Version: 6093d3002eabd7c2913d97f1d1f4ce34b072acf9
Version: 6093d3002eabd7c2913d97f1d1f4ce34b072acf9
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/mc/mc-request.c",
            "drivers/media/v4l2-core/v4l2-ioctl.c"
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          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "4.20"
            },
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              "version": "0",
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              "version": "7.0",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: mc, v4l2: serialize REINIT and REQBUFS with req_queue_mutex\n\nMEDIA_REQUEST_IOC_REINIT can run concurrently with VIDIOC_REQBUFS(0)\nqueue teardown paths. This can race request object cleanup against vb2\nqueue cancellation and lead to use-after-free reports.\n\nWe already serialize request queueing against STREAMON/OFF with\nreq_queue_mutex. Extend that serialization to REQBUFS, and also take\nthe same mutex in media_request_ioctl_reinit() so REINIT is in the\nsame exclusion domain.\n\nThis keeps request cleanup and queue cancellation from running in\nparallel for request-capable devices."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-27T14:03:27.149Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/331242998a7ade5c2f65e14988901614629f3db5"
        },
        {
          "url": "https://git.kernel.org/stable/c/2c685e99efb3b3bd2b78699fba6b1cf321975db0"
        },
        {
          "url": "https://git.kernel.org/stable/c/585fd9a2063dacce8b2820f675ef23d5d17434c5"
        },
        {
          "url": "https://git.kernel.org/stable/c/1a0d9083c24fbd5d22f7100f09d11e4d696a5f01"
        },
        {
          "url": "https://git.kernel.org/stable/c/d8549a453d5bdc0a71de66ad47a1106703406a56"
        },
        {
          "url": "https://git.kernel.org/stable/c/72b9e81e0203f03c40f3adb457f55bd4c8eb112d"
        },
        {
          "url": "https://git.kernel.org/stable/c/cf2023e84f0888f96f4b65dc0804e7f3651969c1"
        },
        {
          "url": "https://git.kernel.org/stable/c/bef4f4a88b73e4cc550d25f665b8a9952af22773"
        }
      ],
      "title": "media: mc, v4l2: serialize REINIT and REQBUFS with req_queue_mutex",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31473",
    "datePublished": "2026-04-22T13:54:00.970Z",
    "dateReserved": "2026-03-09T15:48:24.098Z",
    "dateUpdated": "2026-04-27T14:03:27.149Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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