Vulnerability-Lookup

FKIE_CVE-2022-50274

Vulnerability from fkie_nvd - Published: 2025-09-15 15:15 - Updated: 2026-08-04 10:18

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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: dvbdev: adopts refcnt to avoid UAF dvb_unregister_device() is known that prone to use-after-free. That is, the cleanup from dvb_unregister_device() releases the dvb_device even if there are pointers stored in file->private_data still refer to it. This patch adds a reference counter into struct dvb_device and delays its deallocation until no pointer refers to the object.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0fc044b2b5e2d05a1fa1fb0d7f270367a7855d79	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/219b44bf94203bd433aa91b7796475bf656348e5	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2abd73433872194bccdf1432a0980e4ec5273c2a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6d18b44bb44e1f4d97dfe0efe92ac0f0984739c2	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/88a6f8a72d167294c0931c7874941bf37a41b6dd	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9945d05d6693710574f354c5dbddc47f5101eb77	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a2f0a08aa613176c9688c81d7b598a7779974991	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ac521bbe3d00fa574e66a9361763f2b37725bc97	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/dvb-core/dvb_ca_en50221.c",
            "drivers/media/dvb-core/dvb_frontend.c",
            "drivers/media/dvb-core/dvbdev.c",
            "include/media/dvbdev.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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            },
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              "status": "unaffected",
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      ],
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    }
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  "cveTags": [],
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    }
  ],
  "id": "CVE-2022-50274",
  "lastModified": "2026-08-04T10:18:09.687",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
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  "published": "2025-09-15T15:15:38.330",
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  ]
}

CVE-2022-50274 (GCVE-0-2022-50274)

Vulnerability from cvelistv5 – Published: 2025-09-15 14:21 – Updated: 2026-08-05 08:58

Title

media: dvbdev: adopts refcnt to avoid UAF

Summary

Severity

7.8 (High)


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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/ac521bbe3d00fa574…
https://git.kernel.org/stable/c/219b44bf94203bd43…
https://git.kernel.org/stable/c/6d18b44bb44e1f4d9…
https://git.kernel.org/stable/c/2abd73433872194bc…
https://git.kernel.org/stable/c/88a6f8a72d167294c…
https://git.kernel.org/stable/c/a2f0a08aa613176c9…
https://git.kernel.org/stable/c/9945d05d669371057…
https://git.kernel.org/stable/c/0fc044b2b5e2d05a1…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ac521bbe3d00fa574e66a9361763f2b37725bc97 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 219b44bf94203bd433aa91b7796475bf656348e5 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6d18b44bb44e1f4d97dfe0efe92ac0f0984739c2 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2abd73433872194bccdf1432a0980e4ec5273c2a (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 88a6f8a72d167294c0931c7874941bf37a41b6dd (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a2f0a08aa613176c9688c81d7b598a7779974991 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9945d05d6693710574f354c5dbddc47f5101eb77 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0fc044b2b5e2d05a1fa1fb0d7f270367a7855d79 (git)
Linux	Linux	Affected: 2.6.12 Unaffected: 0 , < 2.6.12 (semver) Unaffected: 4.14.303 , ≤ 4.14.* (semver) Unaffected: 4.19.270 , ≤ 4.19.* (semver) Unaffected: 5.4.229 , ≤ 5.4.* (semver) Unaffected: 5.10.163 , ≤ 5.10.* (semver) Unaffected: 5.15.86 , ≤ 5.15.* (semver) Unaffected: 6.0.16 , ≤ 6.0.* (semver) Unaffected: 6.1.2 , ≤ 6.1.* (semver) Unaffected: 6.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/dvb-core/dvb_ca_en50221.c",
            "drivers/media/dvb-core/dvb_frontend.c",
            "drivers/media/dvb-core/dvbdev.c",
            "include/media/dvbdev.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          ],
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              "status": "unaffected",
              "version": "6.0.16",
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            },
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              "version": "6.1.2",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.163",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.86",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.16",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.2",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: dvbdev: adopts refcnt to avoid UAF\n\ndvb_unregister_device() is known that prone to use-after-free.\nThat is, the cleanup from dvb_unregister_device() releases the dvb_device\neven if there are pointers stored in file-\u003eprivate_data still refer to it.\n\nThis patch adds a reference counter into struct dvb_device and delays its\ndeallocation until no pointer refers to the object."
        }
      ],
      "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The UAF is reached through local chardev operations on /dev/dvb/adapterX/* (open/ioctl/release). Unregister while an fd remains open is triggered by device teardown (USB/FireWire/PCI DVB hot-unplug or driver removal); this is a local device-node attack path, consistent with related dvbdev UAFs (e.g. CVE-2024-27043).\nAC:L - An attacker who opens a DVB node and then causes or observes device unregister (e.g. unplugging a USB/FireWire DVB adapter they control, or teardown on drivers that call dvb_unregister_device without waiting) reliably leaves file-\u003eprivate_data dangling; no uncontrolled race or rare config is required.\nPR:L - Access requires only an unprivileged local user able to open DVB nodes (udev assigns GROUP=video and TAG=uaccess), not root or init-namespace CAP_SYS_ADMIN.\nUI:N - The attacker can open the device and drive subsequent ioctls/close themselves; no separate victim action is required once they have local access and can induce or time device teardown.\nS:U - Impact is confined to the host kernel\u0027s privilege domain (local privilege escalation / memory corruption); there is no VM, IOMMU, or other security-authority boundary crossing.\nC:H - Use-after-free of struct dvb_device via file-\u003eprivate_data enables heap reuse and arbitrary read primitives through subsequent ioctl/release paths (per UAF guidance).\nI:H - The same UAF on a kmalloc object used for ioctl dispatch (dvb_generic_ioctl \u2192 dvbdev-\u003ekernel_ioctl) enables heap spraying and control-flow/write primitives for code execution.\nA:H - Dereferencing the freed dvb_device on ioctl or release causes kernel oops/crash even without full exploitation; UAF availability impact is High."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:58:01.283Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ac521bbe3d00fa574e66a9361763f2b37725bc97"
        },
        {
          "url": "https://git.kernel.org/stable/c/219b44bf94203bd433aa91b7796475bf656348e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/6d18b44bb44e1f4d97dfe0efe92ac0f0984739c2"
        },
        {
          "url": "https://git.kernel.org/stable/c/2abd73433872194bccdf1432a0980e4ec5273c2a"
        },
        {
          "url": "https://git.kernel.org/stable/c/88a6f8a72d167294c0931c7874941bf37a41b6dd"
        },
        {
          "url": "https://git.kernel.org/stable/c/a2f0a08aa613176c9688c81d7b598a7779974991"
        },
        {
          "url": "https://git.kernel.org/stable/c/9945d05d6693710574f354c5dbddc47f5101eb77"
        },
        {
          "url": "https://git.kernel.org/stable/c/0fc044b2b5e2d05a1fa1fb0d7f270367a7855d79"
        }
      ],
      "title": "media: dvbdev: adopts refcnt to avoid UAF",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50274",
    "datePublished": "2025-09-15T14:21:10.383Z",
    "dateReserved": "2025-09-15T13:58:00.975Z",
    "dateUpdated": "2026-08-05T08:58:01.283Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.