FKIE_CVE-2021-47239

Vulnerability from fkie_nvd - Published: 2024-05-21 15:15 - Updated: 2026-06-17 04:16
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: net: usb: fix possible use-after-free in smsc75xx_bind The commit 46a8b29c6306 ("net: usb: fix memory leak in smsc75xx_bind") fails to clean up the work scheduled in smsc75xx_reset-> smsc75xx_set_multicast, which leads to use-after-free if the work is scheduled to start after the deallocation. In addition, this patch also removes a dangling pointer - dev->data[0]. This patch calls cancel_work_sync to cancel the scheduled work and set the dangling pointer to NULL.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/14616c372a7be01a2fb8c56c9d8debd232b9e43dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2fc8300c9cfa5167fcb5b1a2a07db6f53e82f59bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4252bf6c2b245f47011098113d405ffad6ad5d5bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/56b786d86694e079d8aad9b314e015cd4ac02a3dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/570a52cf3e01d19f7fd1a251dfc52b0cd86c13cbPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/64160d1741a3de5204d1a822e058e0b4cc526504Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7cc8b2e05fcea6edd022d26e82091d781af8fd9bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c4e3be2e7742863e454ce31faf8fd0109c00050bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/14616c372a7be01a2fb8c56c9d8debd232b9e43dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2fc8300c9cfa5167fcb5b1a2a07db6f53e82f59bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4252bf6c2b245f47011098113d405ffad6ad5d5bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/56b786d86694e079d8aad9b314e015cd4ac02a3dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/570a52cf3e01d19f7fd1a251dfc52b0cd86c13cbPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/64160d1741a3de5204d1a822e058e0b4cc526504Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7cc8b2e05fcea6edd022d26e82091d781af8fd9bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c4e3be2e7742863e454ce31faf8fd0109c00050bPatch
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 *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/usb/smsc75xx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "versionType": "git"
            },
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              "versionType": "git"
            },
            {
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              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
            },
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              "versionType": "git"
            },
            {
              "lessThan": "570a52cf3e01d19f7fd1a251dfc52b0cd86c13cb",
              "status": "affected",
              "version": "635ac38b36255d3cfb8312cf7c471334f4d537e0",
              "versionType": "git"
            },
            {
              "lessThan": "14616c372a7be01a2fb8c56c9d8debd232b9e43d",
              "status": "affected",
              "version": "70c886ac93f87ae7214a0c69151a28a8075dd95b",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "46a8b29c6306d8bbfd92b614ef65a47c900d8e70",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/usb/smsc75xx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4.4.274",
              "status": "affected",
              "version": "4.4.271",
              "versionType": "semver"
            },
            {
              "lessThan": "4.9.274",
              "status": "affected",
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              "versionType": "semver"
            },
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              "status": "affected",
              "version": "4.19.193",
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            },
            {
              "lessThan": "5.4.128",
              "status": "affected",
              "version": "5.4.124",
              "versionType": "semver"
            },
            {
              "lessThan": "5.10.46",
              "status": "affected",
              "version": "5.10.42",
              "versionType": "semver"
            },
            {
              "lessThan": "5.12.13",
              "status": "affected",
              "version": "5.12.9",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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            {
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          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: fix possible use-after-free in smsc75xx_bind\n\nThe commit 46a8b29c6306 (\"net: usb: fix memory leak in smsc75xx_bind\")\nfails to clean up the work scheduled in smsc75xx_reset-\u003e\nsmsc75xx_set_multicast, which leads to use-after-free if the work is\nscheduled to start after the deallocation. In addition, this patch\nalso removes a dangling pointer - dev-\u003edata[0].\n\nThis patch calls cancel_work_sync to cancel the scheduled work and set\nthe dangling pointer to NULL."
    },
    {
      "lang": "es",
      "value": " En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net:usb: corrige posible use after free en smsc75xx_bind. La confirmaci\u00f3n 46a8b29c6306 (\"net:usb: corrige la p\u00e9rdida de memoria en smsc75xx_bind\") no logra limpiar el trabajo programado en smsc75xx_reset -\u0026gt; smsc75xx_set_multicast, lo que genera use after free si el trabajo est\u00e1 programado para comenzar despu\u00e9s de la desasignaci\u00f3n. Adem\u00e1s, este parche tambi\u00e9n elimina un puntero colgante: dev-\u0026gt;data[0]. Este parche llama a cancel_work_sync para cancelar el trabajo programado y establecer el puntero colgante en NULL."
    }
  ],
  "id": "CVE-2021-47239",
  "lastModified": "2026-06-17T04:16:59.147",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-47239",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-09-10T15:40:00.710972Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-05-21T15:15:13.100",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/14616c372a7be01a2fb8c56c9d8debd232b9e43d"
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      "tags": [
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    },
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      "tags": [
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    },
    {
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    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
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    },
    {
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      "tags": [
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      "url": "https://git.kernel.org/stable/c/64160d1741a3de5204d1a822e058e0b4cc526504"
    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
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      ],
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    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
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      "url": "https://git.kernel.org/stable/c/c4e3be2e7742863e454ce31faf8fd0109c00050b"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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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.


Detection rules are retrieved from Rulezet.