FKIE_CVE-2021-47521

Vulnerability from fkie_nvd - Published: 2024-05-24 15:15 - Updated: 2026-06-17 04:17
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: can: sja1000: fix use after free in ems_pcmcia_add_card() If the last channel is not available then "dev" is freed. Fortunately, we can just use "pdev->irq" instead. Also we should check if at least one channel was set up.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1a295fea90e1acbe80c6d4940f5ff856edcd6becPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1dd5b819f7e406dc15bbc7670596ff25261aaa2aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3ec6ca6b1a8e64389f0212b5a1b0f6fed1909e45Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/474f9a8534f5f89841240a7e978bafd6e1e039cePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/923f4dc5df679f678e121c20bf2fd70f7bf3e288Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c8718026ba287168ff9ad0ccc4f9a413062cba36Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cbd86110546f7f730a1f5d7de56c944a336c15c4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ccf070183e4655824936c0f96c4a2bcca93419aaPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1a295fea90e1acbe80c6d4940f5ff856edcd6becPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1dd5b819f7e406dc15bbc7670596ff25261aaa2aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3ec6ca6b1a8e64389f0212b5a1b0f6fed1909e45Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/474f9a8534f5f89841240a7e978bafd6e1e039cePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/923f4dc5df679f678e121c20bf2fd70f7bf3e288Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c8718026ba287168ff9ad0ccc4f9a413062cba36Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/cbd86110546f7f730a1f5d7de56c944a336c15c4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ccf070183e4655824936c0f96c4a2bcca93419aaPatch
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/can/sja1000/ems_pcmcia.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "cbd86110546f7f730a1f5d7de56c944a336c15c4",
              "status": "affected",
              "version": "fd734c6f25aea4b2b44b045e489aec67b388577e",
              "versionType": "git"
            },
            {
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "fd734c6f25aea4b2b44b045e489aec67b388577e",
              "versionType": "git"
            },
            {
              "lessThan": "ccf070183e4655824936c0f96c4a2bcca93419aa",
              "status": "affected",
              "version": "fd734c6f25aea4b2b44b045e489aec67b388577e",
              "versionType": "git"
            },
            {
              "lessThan": "1a295fea90e1acbe80c6d4940f5ff856edcd6bec",
              "status": "affected",
              "version": "fd734c6f25aea4b2b44b045e489aec67b388577e",
              "versionType": "git"
            },
            {
              "lessThan": "923f4dc5df679f678e121c20bf2fd70f7bf3e288",
              "status": "affected",
              "version": "fd734c6f25aea4b2b44b045e489aec67b388577e",
              "versionType": "git"
            },
            {
              "lessThan": "474f9a8534f5f89841240a7e978bafd6e1e039ce",
              "status": "affected",
              "version": "fd734c6f25aea4b2b44b045e489aec67b388577e",
              "versionType": "git"
            },
            {
              "lessThan": "3ec6ca6b1a8e64389f0212b5a1b0f6fed1909e45",
              "status": "affected",
              "version": "fd734c6f25aea4b2b44b045e489aec67b388577e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/can/sja1000/ems_pcmcia.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.2"
            },
            {
              "lessThan": "3.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.4.*",
              "status": "unaffected",
              "version": "4.4.295",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.293",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.165",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.85",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "4.9.293",
              "versionStartIncluding": "4.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "4.19.221",
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            {
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            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D9668578-08F7-4694-A86F-FCE448387A79",
              "versionEndExcluding": "5.10.85",
              "versionStartIncluding": "5.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "6664ACE2-F748-4AE5-B98B-58803B0B2C3E",
              "versionEndExcluding": "5.15.8",
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              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: sja1000: fix use after free in ems_pcmcia_add_card()\n\nIf the last channel is not available then \"dev\" is freed.  Fortunately,\nwe can just use \"pdev-\u003eirq\" instead.\n\nAlso we should check if at least one channel was set up."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: can: sja1000: arreglar el use after free en ems_pcmcia_add_card() Si el \u00faltimo canal no est\u00e1 disponible entonces se libera \"dev\". Afortunadamente, podemos usar \"pdev-\u0026gt;irq\" en su lugar. Tambi\u00e9n debemos comprobar si se configur\u00f3 al menos un canal."
    }
  ],
  "id": "CVE-2021-47521",
  "lastModified": "2026-06-17T04:17:41.110",
  "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-2021-47521",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-05-29T16:55:46.664460Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-05-24T15:15:14.203",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      ],
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    },
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      "tags": [
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    },
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    },
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      ],
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    },
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    },
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      ],
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    },
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  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "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.