CVE-2021-47339 (GCVE-0-2021-47339)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-05-11 13:52
VLAI
Title
media: v4l2-core: explicitly clear ioctl input data
Summary
In the Linux kernel, the following vulnerability has been resolved: media: v4l2-core: explicitly clear ioctl input data As seen from a recent syzbot bug report, mistakes in the compat ioctl implementation can lead to uninitialized kernel stack data getting used as input for driver ioctl handlers. The reported bug is now fixed, but it's possible that other related bugs are still present or get added in the future. As the drivers need to check user input already, the possible impact is fairly low, but it might still cause an information leak. To be on the safe side, always clear the entire ioctl buffer before calling the conversion handler functions that are meant to initialize them.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:38 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8dbcc3fa387c16abfc88a628cf528c439c91b332 , < dc02c0b2bd6096f2f3ce63e1fc317aeda05f74d8 (git)
Affected: 8dbcc3fa387c16abfc88a628cf528c439c91b332 , < bfb48b54db25c3b4ef4bef5e0691464ebc4aa335 (git)
Affected: 8dbcc3fa387c16abfc88a628cf528c439c91b332 , < 7b53cca764f9b291b7907fcd39d9e66ad728ee0b (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.12.18 , ≤ 5.12.* (semver)
Unaffected: 5.13.3 , ≤ 5.13.* (semver)
Unaffected: 5.14 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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                    "timestamp": "2024-09-10T15:38:53.466154Z",
                    "version": "2.0.3"
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              "dateUpdated": "2024-09-11T12:42:18.970Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/media/v4l2-core/v4l2-ioctl.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "vendor": "Linux",
              "versions": [
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                  "status": "affected",
                  "version": "5.11"
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                  "status": "unaffected",
                  "version": "0",
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                  "status": "unaffected",
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                  "status": "unaffected",
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                  "versionType": "original_commit_for_fix"
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          "descriptions": [
            {
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: v4l2-core: explicitly clear ioctl input data\n\nAs seen from a recent syzbot bug report, mistakes in the compat ioctl\nimplementation can lead to uninitialized kernel stack data getting used\nas input for driver ioctl handlers.\n\nThe reported bug is now fixed, but it\u0027s possible that other related\nbugs are still present or get added in the future. As the drivers need\nto check user input already, the possible impact is fairly low, but it\nmight still cause an information leak.\n\nTo be on the safe side, always clear the entire ioctl buffer before\ncalling the conversion handler functions that are meant to initialize\nthem."
            }
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            {
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            }
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          "title": "media: v4l2-core: explicitly clear ioctl input data",
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        }
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      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47339",
        "datePublished": "2024-05-21T14:35:47.683Z",
        "dateReserved": "2024-05-21T14:28:16.978Z",
        "dateUpdated": "2025-12-18T11:36:59.076Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.