CVE-2022-48961 (GCVE-0-2022-48961)

Vulnerability from cvelistv5 – Published: 2024-10-21 20:05 – Updated: 2026-05-11 18:50
VLAI
Title
net: mdio: fix unbalanced fwnode reference count in mdio_device_release()
Summary
In the Linux kernel, the following vulnerability has been resolved: net: mdio: fix unbalanced fwnode reference count in mdio_device_release() There is warning report about of_node refcount leak while probing mdio device: OF: ERROR: memory leak, expected refcount 1 instead of 2, of_node_get()/of_node_put() unbalanced - destroy cset entry: attach overlay node /spi/soc@0/mdio@710700c0/ethernet@4 In of_mdiobus_register_device(), we increase fwnode refcount by fwnode_handle_get() before associating the of_node with mdio device, but it has never been decreased in normal path. Since that, in mdio_device_release(), it needs to call fwnode_handle_put() in addition instead of calling kfree() directly. After above, just calling mdio_device_free() in the error handle path of of_mdiobus_register_device() is enough to keep the refcount balanced.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-22 13:20 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a9049e0c513c4521dbfaa302af8ed08b3366b41f , < 16854177745a5648f8ec322353b432e18460f43a (git)
Affected: a9049e0c513c4521dbfaa302af8ed08b3366b41f , < a5c6de1a6656b8cc6bce7cb3d9874dd7df4968c3 (git)
Affected: a9049e0c513c4521dbfaa302af8ed08b3366b41f , < cb37617687f2bfa5b675df7779f869147c9002bd (git)
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Linux Linux Affected: 4.5
Unaffected: 0 , < 4.5 (semver)
Unaffected: 5.15.83 , ≤ 5.15.* (semver)
Unaffected: 6.0.13 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
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              "impactScore": 3.6,
              "source": "nvd@nist.gov",
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              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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                ],
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    },
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      "current_release_date": "2026-08-19T19:37:26+00:00",
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      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "196",
      "product_status:known_not_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: mdio: fix unbalanced fwnode reference count in mdio_device_release()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-48961.json",
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      "source": "SUSE CSAF VEX",
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      "title": "SUSE CVE CVE-2022-48961",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-48961.json",
      "version": "52"
    },
    "vulnrichment": {
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            "metrics": [
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                  "content": {
                    "id": "CVE-2022-48961",
                    "options": [
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              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
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        "cna": {
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              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
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                  "lessThanOrEqual": "6.0.*",
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mdio: fix unbalanced fwnode reference count in mdio_device_release()\n\nThere is warning report about of_node refcount leak\nwhile probing mdio device:\n\nOF: ERROR: memory leak, expected refcount 1 instead of 2,\nof_node_get()/of_node_put() unbalanced - destroy cset entry:\nattach overlay node /spi/soc@0/mdio@710700c0/ethernet@4\n\nIn of_mdiobus_register_device(), we increase fwnode refcount\nby fwnode_handle_get() before associating the of_node with\nmdio device, but it has never been decreased in normal path.\nSince that, in mdio_device_release(), it needs to call\nfwnode_handle_put() in addition instead of calling kfree()\ndirectly.\n\nAfter above, just calling mdio_device_free() in the error handle\npath of of_mdiobus_register_device() is enough to keep the\nrefcount balanced."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-05-04T08:26:59.413Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            {
              "url": "https://git.kernel.org/stable/c/cb37617687f2bfa5b675df7779f869147c9002bd"
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        "assignerShortName": "Linux",
        "cveId": "CVE-2022-48961",
        "datePublished": "2024-10-21T20:05:45.849Z",
        "dateReserved": "2024-08-22T01:27:53.628Z",
        "dateUpdated": "2025-05-04T08:26:59.413Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
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    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



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.