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CVE-2021-47416 (GCVE-0-2021-47416)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:04 – Updated: 2026-05-11 13:54
VLAI
Title
phy: mdio: fix memory leak
Summary
In the Linux kernel, the following vulnerability has been resolved: phy: mdio: fix memory leak Syzbot reported memory leak in MDIO bus interface, the problem was in wrong state logic. MDIOBUS_ALLOCATED indicates 2 states: 1. Bus is only allocated 2. Bus allocated and __mdiobus_register() fails, but device_register() was called In case of device_register() has been called we should call put_device() to correctly free the memory allocated for this device, but mdiobus_free() calls just kfree(dev) in case of MDIOBUS_ALLOCATED state To avoid this behaviour we need to set bus->state to MDIOBUS_UNREGISTERED _before_ calling device_register(), because put_device() should be called even in case of device_register() failure.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-21 17:32 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 46abc02175b3c246dd5141d878f565a8725060c9 , < 25e9f88c7e3cc35f5e3d3db199660d28a15df639 (git)
Affected: 46abc02175b3c246dd5141d878f565a8725060c9 , < 2250392d930bd0d989f24d355d6355b0150256e7 (git)
Affected: 46abc02175b3c246dd5141d878f565a8725060c9 , < f4f502a04ee1e543825af78f47eb7785015cd9f6 (git)
Affected: 46abc02175b3c246dd5141d878f565a8725060c9 , < 2397b9e118721292429fea8807a698e71b94795f (git)
Affected: 46abc02175b3c246dd5141d878f565a8725060c9 , < 414bb4ead1362ef2c8592db723c017258f213988 (git)
Affected: 46abc02175b3c246dd5141d878f565a8725060c9 , < 0d2dd40a7be61b89a7c99dae8ee96389d27b413a (git)
Affected: 46abc02175b3c246dd5141d878f565a8725060c9 , < 064c2616234a7394867c924b5c1303974f3a4f4d (git)
Affected: 46abc02175b3c246dd5141d878f565a8725060c9 , < ca6e11c337daf7925ff8a2aac8e84490a8691905 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.28
Unaffected: 0 , < 2.6.28 (semver)
Unaffected: 4.4.289 , ≤ 4.4.* (semver)
Unaffected: 4.9.287 , ≤ 4.9.* (semver)
Unaffected: 4.14.251 , ≤ 4.14.* (semver)
Unaffected: 4.19.211 , ≤ 4.19.* (semver)
Unaffected: 5.4.153 , ≤ 5.4.* (semver)
Unaffected: 5.10.73 , ≤ 5.10.* (semver)
Unaffected: 5.14.12 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/net/phy/mdio_bus.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "25e9f88c7e3cc35f5e3d3db199660d28a15df639",
                  "status": "affected",
                  "version": "46abc02175b3c246dd5141d878f565a8725060c9",
                  "versionType": "git"
                },
                {
                  "lessThan": "2250392d930bd0d989f24d355d6355b0150256e7",
                  "status": "affected",
                  "version": "46abc02175b3c246dd5141d878f565a8725060c9",
                  "versionType": "git"
                },
                {
                  "lessThan": "f4f502a04ee1e543825af78f47eb7785015cd9f6",
                  "status": "affected",
                  "version": "46abc02175b3c246dd5141d878f565a8725060c9",
                  "versionType": "git"
                },
                {
                  "lessThan": "2397b9e118721292429fea8807a698e71b94795f",
                  "status": "affected",
                  "version": "46abc02175b3c246dd5141d878f565a8725060c9",
                  "versionType": "git"
                },
                {
                  "lessThan": "414bb4ead1362ef2c8592db723c017258f213988",
                  "status": "affected",
                  "version": "46abc02175b3c246dd5141d878f565a8725060c9",
                  "versionType": "git"
                },
                {
                  "lessThan": "0d2dd40a7be61b89a7c99dae8ee96389d27b413a",
                  "status": "affected",
                  "version": "46abc02175b3c246dd5141d878f565a8725060c9",
                  "versionType": "git"
                },
                {
                  "lessThan": "064c2616234a7394867c924b5c1303974f3a4f4d",
                  "status": "affected",
                  "version": "46abc02175b3c246dd5141d878f565a8725060c9",
                  "versionType": "git"
                },
                {
                  "lessThan": "ca6e11c337daf7925ff8a2aac8e84490a8691905",
                  "status": "affected",
                  "version": "46abc02175b3c246dd5141d878f565a8725060c9",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/net/phy/mdio_bus.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "2.6.28"
                },
                {
                  "lessThan": "2.6.28",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.4.*",
                  "status": "unaffected",
                  "version": "4.4.289",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.9.*",
                  "status": "unaffected",
                  "version": "4.9.287",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.14.*",
                  "status": "unaffected",
                  "version": "4.14.251",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.19.*",
                  "status": "unaffected",
                  "version": "4.19.211",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.153",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.73",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.14.*",
                  "status": "unaffected",
                  "version": "5.14.12",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.15",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.4.289",
                      "versionStartIncluding": "2.6.28",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.9.287",
                      "versionStartIncluding": "2.6.28",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.14.251",
                      "versionStartIncluding": "2.6.28",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.19.211",
                      "versionStartIncluding": "2.6.28",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.153",
                      "versionStartIncluding": "2.6.28",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.73",
                      "versionStartIncluding": "2.6.28",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.14.12",
                      "versionStartIncluding": "2.6.28",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15",
                      "versionStartIncluding": "2.6.28",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nphy: mdio: fix memory leak\n\nSyzbot reported memory leak in MDIO bus interface, the problem was in\nwrong state logic.\n\nMDIOBUS_ALLOCATED indicates 2 states:\n\t1. Bus is only allocated\n\t2. Bus allocated and __mdiobus_register() fails, but\n\t   device_register() was called\n\nIn case of device_register() has been called we should call put_device()\nto correctly free the memory allocated for this device, but mdiobus_free()\ncalls just kfree(dev) in case of MDIOBUS_ALLOCATED state\n\nTo avoid this behaviour we need to set bus-\u003estate to MDIOBUS_UNREGISTERED\n_before_ calling device_register(), because put_device() should be\ncalled even in case of device_register() failure."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-05-04T07:10:28.073Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/25e9f88c7e3cc35f5e3d3db199660d28a15df639"
            },
            {
              "url": "https://git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7"
            },
            {
              "url": "https://git.kernel.org/stable/c/f4f502a04ee1e543825af78f47eb7785015cd9f6"
            },
            {
              "url": "https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795f"
            },
            {
              "url": "https://git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988"
            },
            {
              "url": "https://git.kernel.org/stable/c/0d2dd40a7be61b89a7c99dae8ee96389d27b413a"
            },
            {
              "url": "https://git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974f3a4f4d"
            },
            {
              "url": "https://git.kernel.org/stable/c/ca6e11c337daf7925ff8a2aac8e84490a8691905"
            }
          ],
          "title": "phy: mdio: fix memory leak",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47416",
        "datePublished": "2024-05-21T15:04:06.042Z",
        "dateReserved": "2024-05-21T14:58:30.818Z",
        "dateUpdated": "2025-05-04T07:10:28.073Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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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

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.


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.