FKIE_CVE-2021-47232

Vulnerability from fkie_nvd - Published: 2024-05-21 15:15 - Updated: 2026-06-17 04:16
Severity
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: can: j1939: fix Use-after-Free, hold skb ref while in use This patch fixes a Use-after-Free found by the syzbot. The problem is that a skb is taken from the per-session skb queue, without incrementing the ref count. This leads to a Use-after-Free if the skb is taken concurrently from the session queue due to a CTS.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1071065eeb33d32b7d98c2ce7591881ae7381705Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2030043e616cab40f510299f09b636285e0a3678Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/22cba878abf646cd3a02ee7c8c2cef7afe66a256Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/509ab6bfdd0c76daebbad0f0af07da712116de22Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1071065eeb33d32b7d98c2ce7591881ae7381705Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2030043e616cab40f510299f09b636285e0a3678Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/22cba878abf646cd3a02ee7c8c2cef7afe66a256Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/509ab6bfdd0c76daebbad0f0af07da712116de22Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/can/j1939/transport.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "9d71dd0c70099914fcd063135da3c580865e924c",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
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          ]
        },
        {
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          "product": "Linux",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.4"
            },
            {
              "lessThan": "5.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.4.128",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.46",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.12.*",
              "status": "unaffected",
              "version": "5.12.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
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    },
    {
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              "status": "affected",
              "version": "9d71dd0c7009",
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        {
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          "versions": [
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              "status": "affected",
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          "defaultStatus": "unknown",
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          "defaultStatus": "unknown",
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              "status": "unaffected",
              "version": " 5.10.46",
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        },
        {
          "cpes": [
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          ],
          "defaultStatus": "unknown",
          "product": "linux_kernel",
          "vendor": "linux",
          "versions": [
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              "status": "unaffected",
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          ]
        },
        {
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          ],
          "defaultStatus": "unknown",
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          "versions": [
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              "version": "5.13"
            }
          ]
        },
        {
          "cpes": [
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          ],
          "defaultStatus": "unknown",
          "product": "linux_kernel",
          "vendor": "linux",
          "versions": [
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              "lessThan": "5.4",
              "status": "unaffected",
              "version": "0",
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          ]
        },
        {
          "cpes": [
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          ],
          "defaultStatus": "unknown",
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          "vendor": "linux",
          "versions": [
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              "status": "affected",
              "version": "5.4"
            }
          ]
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
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              "matchCriteriaId": "8C2A72CA-7A16-4ACC-8D7D-6132A9D8B054",
              "versionEndExcluding": "5.4.128",
              "versionStartIncluding": "5.4",
              "vulnerable": true
            },
            {
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            },
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              "vulnerable": true
            },
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              "matchCriteriaId": "96AC23B2-D46A-49D9-8203-8E1BEDCA8532",
              "vulnerable": true
            },
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              "matchCriteriaId": "DA610E30-717C-4700-9F77-A3C9244F3BFD",
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          "negate": false,
          "operator": "OR"
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      ]
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: j1939: fix Use-after-Free, hold skb ref while in use\n\nThis patch fixes a Use-after-Free found by the syzbot.\n\nThe problem is that a skb is taken from the per-session skb queue,\nwithout incrementing the ref count. This leads to a Use-after-Free if\nthe skb is taken concurrently from the session queue due to a CTS."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: can: j1939: corrige Use-after-Free, mantenga presionada la referencia skb mientras est\u00e1 en uso. Este parche corrige un Use-after-Free encontrado por syzbot. El problema es que se toma un skb de la cola de skb por sesi\u00f3n, sin incrementar el recuento de referencias. Esto conduce a un use after free si el skb se toma simult\u00e1neamente de la cola de sesi\u00f3n debido a un CTS."
    }
  ],
  "id": "CVE-2021-47232",
  "lastModified": "2026-06-17T04:16:58.013",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 8.4,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.5,
        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-47232",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-05-28T19:03:26.982947Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-05-21T15:15:12.557",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/1071065eeb33d32b7d98c2ce7591881ae7381705"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/2030043e616cab40f510299f09b636285e0a3678"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/22cba878abf646cd3a02ee7c8c2cef7afe66a256"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/509ab6bfdd0c76daebbad0f0af07da712116de22"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/1071065eeb33d32b7d98c2ce7591881ae7381705"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/2030043e616cab40f510299f09b636285e0a3678"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/22cba878abf646cd3a02ee7c8c2cef7afe66a256"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/509ab6bfdd0c76daebbad0f0af07da712116de22"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}



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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.
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  • 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.


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