FKIE_CVE-2021-47520

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: pch_can: pch_can_rx_normal: fix use after free After calling netif_receive_skb(skb), dereferencing skb is unsafe. Especially, the can_frame cf which aliases skb memory is dereferenced just after the call netif_receive_skb(skb). Reordering the lines solves the issue.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aaPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/94cddf1e9227a171b27292509d59691819c458dbPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/affbad02bf80380a7403885b9fe4a1587d1bb4f3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bafe343a885c70dddf358379cf0b2a1c07355d8dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aaPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/94cddf1e9227a171b27292509d59691819c458dbPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/affbad02bf80380a7403885b9fe4a1587d1bb4f3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/bafe343a885c70dddf358379cf0b2a1c07355d8dPatch
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/pch_can.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "bafe343a885c70dddf358379cf0b2a1c07355d8d",
              "status": "affected",
              "version": "b21d18b51b31a24d17f883b678432fbdee3d5675",
              "versionType": "git"
            },
            {
              "lessThan": "3a3c46e2eff0577454860a203be1a8295f4acb76",
              "status": "affected",
              "version": "b21d18b51b31a24d17f883b678432fbdee3d5675",
              "versionType": "git"
            },
            {
              "lessThan": "affbad02bf80380a7403885b9fe4a1587d1bb4f3",
              "status": "affected",
              "version": "b21d18b51b31a24d17f883b678432fbdee3d5675",
              "versionType": "git"
            },
            {
              "lessThan": "3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa",
              "status": "affected",
              "version": "b21d18b51b31a24d17f883b678432fbdee3d5675",
              "versionType": "git"
            },
            {
              "lessThan": "abb4eff3dcd2e583060082a18a8dbf31f02689d4",
              "status": "affected",
              "version": "b21d18b51b31a24d17f883b678432fbdee3d5675",
              "versionType": "git"
            },
            {
              "lessThan": "703dde112021c93d6e89443c070e7dbd4dea612e",
              "status": "affected",
              "version": "b21d18b51b31a24d17f883b678432fbdee3d5675",
              "versionType": "git"
            },
            {
              "lessThan": "6c73fc931658d8cbc8a1714b326cb31eb71d16a7",
              "status": "affected",
              "version": "b21d18b51b31a24d17f883b678432fbdee3d5675",
              "versionType": "git"
            },
            {
              "lessThan": "94cddf1e9227a171b27292509d59691819c458db",
              "status": "affected",
              "version": "b21d18b51b31a24d17f883b678432fbdee3d5675",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/can/pch_can.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.37"
            },
            {
              "lessThan": "2.6.37",
              "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": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "0BFBC5B8-3555-4F40-8066-0E6481B4B7F2",
              "versionEndExcluding": "4.4.295",
              "versionStartIncluding": "2.6.37",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "5D107324-F4B9-4146-BACC-391E95D41D67",
              "versionEndExcluding": "4.9.293",
              "versionStartIncluding": "4.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "71B2A056-7541-4FF3-859E-C55955DDA2DD",
              "versionEndExcluding": "4.14.258",
              "versionStartIncluding": "4.10",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "CECDDE2F-DEEF-4D3A-85FF-6AEBA16D225B",
              "versionEndExcluding": "4.19.221",
              "versionStartIncluding": "4.15",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B1DD3148-41FC-42AC-96A5-F63D774A97A3",
              "versionEndExcluding": "5.4.165",
              "versionStartIncluding": "4.20",
              "vulnerable": true
            },
            {
              "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",
              "versionStartIncluding": "5.11",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: pch_can: pch_can_rx_normal: fix use after free\n\nAfter calling netif_receive_skb(skb), dereferencing skb is unsafe.\nEspecially, the can_frame cf which aliases skb memory is dereferenced\njust after the call netif_receive_skb(skb).\n\nReordering the lines solves the issue."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: can: pch_can: pch_can_rx_normal: corregir el use after free despu\u00e9s de llamar a netif_receive_skb(skb), desreferenciar skb no es seguro. Especialmente, el can_frame cf que alias la memoria skb se desreferencia justo despu\u00e9s de la llamada netif_receive_skb(skb). Reordenar las l\u00edneas resuelve el problema."
    }
  ],
  "id": "CVE-2021-47520",
  "lastModified": "2026-06-17T04:17:40.963",
  "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-2021-47520",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-06-17T18:03:24.271974Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-05-24T15:15:14.003",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76"
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      "url": "https://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa"
    },
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    },
    {
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      "url": "https://git.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612e"
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      "url": "https://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4"
    },
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    },
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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7"
    },
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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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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      ],
      "url": "https://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/bafe343a885c70dddf358379cf0b2a1c07355d8d"
    }
  ],
  "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.