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CVE-2021-47239 (GCVE-0-2021-47239)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:19 – Updated: 2026-05-11 13:50
VLAI
Title
net: usb: fix possible use-after-free in smsc75xx_bind
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.
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 15:40 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 200dbfcad8011e50c3cec269ed7b980836eeb1fa , < 7cc8b2e05fcea6edd022d26e82091d781af8fd9b (git)
Affected: 22c840596af0c09068b6cf948616e6496e59e07f , < 64160d1741a3de5204d1a822e058e0b4cc526504 (git)
Affected: 9e6b8c1ff9d997e1fa16cbd2d60739adf6dc1bbc , < c4e3be2e7742863e454ce31faf8fd0109c00050b (git)
Affected: 9e6a3eccb28779710cbbafc4f4258d92509c6d07 , < 2fc8300c9cfa5167fcb5b1a2a07db6f53e82f59b (git)
Affected: b95fb96e6339e34694dd578fb6bde3575b01af17 , < 4252bf6c2b245f47011098113d405ffad6ad5d5b (git)
Affected: 635ac38b36255d3cfb8312cf7c471334f4d537e0 , < 570a52cf3e01d19f7fd1a251dfc52b0cd86c13cb (git)
Affected: 70c886ac93f87ae7214a0c69151a28a8075dd95b , < 14616c372a7be01a2fb8c56c9d8debd232b9e43d (git)
Affected: 46a8b29c6306d8bbfd92b614ef65a47c900d8e70 , < 56b786d86694e079d8aad9b314e015cd4ac02a3d (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.4.271 , < 4.4.274 (semver)
Affected: 4.9.271 , < 4.9.274 (semver)
Affected: 4.14.235 , < 4.14.238 (semver)
Affected: 4.19.193 , < 4.19.196 (semver)
Affected: 5.4.124 , < 5.4.128 (semver)
Affected: 5.10.42 , < 5.10.46 (semver)
Affected: 5.12.9 , < 5.12.13 (semver)
guessed Create a notification for this product.
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                  "versionType": "semver"
                },
                {
                  "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"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.4.274",
                      "versionStartIncluding": "4.4.271",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.9.274",
                      "versionStartIncluding": "4.9.271",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.14.238",
                      "versionStartIncluding": "4.14.235",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.19.196",
                      "versionStartIncluding": "4.19.193",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.128",
                      "versionStartIncluding": "5.4.124",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.46",
                      "versionStartIncluding": "5.10.42",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.12.13",
                      "versionStartIncluding": "5.12.9",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "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."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-11T13:50:39.132Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/7cc8b2e05fcea6edd022d26e82091d781af8fd9b"
            },
            {
              "url": "https://git.kernel.org/stable/c/64160d1741a3de5204d1a822e058e0b4cc526504"
            },
            {
              "url": "https://git.kernel.org/stable/c/c4e3be2e7742863e454ce31faf8fd0109c00050b"
            },
            {
              "url": "https://git.kernel.org/stable/c/2fc8300c9cfa5167fcb5b1a2a07db6f53e82f59b"
            },
            {
              "url": "https://git.kernel.org/stable/c/4252bf6c2b245f47011098113d405ffad6ad5d5b"
            },
            {
              "url": "https://git.kernel.org/stable/c/570a52cf3e01d19f7fd1a251dfc52b0cd86c13cb"
            },
            {
              "url": "https://git.kernel.org/stable/c/14616c372a7be01a2fb8c56c9d8debd232b9e43d"
            },
            {
              "url": "https://git.kernel.org/stable/c/56b786d86694e079d8aad9b314e015cd4ac02a3d"
            }
          ],
          "title": "net: usb: fix possible use-after-free in smsc75xx_bind",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47239",
        "datePublished": "2024-05-21T14:19:39.705Z",
        "dateReserved": "2024-04-10T18:59:19.532Z",
        "dateUpdated": "2026-05-11T13:50:39.132Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.