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FKIE_CVE-2021-47559

Vulnerability from fkie_nvd - Published: 2024-05-24 15:15 - Updated: 2026-08-04 10:17
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net/smc: Fix NULL pointer dereferencing in smc_vlan_by_tcpsk() Coverity reports a possible NULL dereferencing problem: in smc_vlan_by_tcpsk(): 6. returned_null: netdev_lower_get_next returns NULL (checked 29 out of 30 times). 7. var_assigned: Assigning: ndev = NULL return value from netdev_lower_get_next. 1623 ndev = (struct net_device *)netdev_lower_get_next(ndev, &lower); CID 1468509 (#1 of 1): Dereference null return value (NULL_RETURNS) 8. dereference: Dereferencing a pointer that might be NULL ndev when calling is_vlan_dev. 1624 if (is_vlan_dev(ndev)) { Remove the manual implementation and use netdev_walk_all_lower_dev() to iterate over the lower devices. While on it remove an obsolete function parameter comment.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/587acad41f1bc48e16f42bb2aca63bf323380be8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bb851d0fb02547d03cd40106b5f2391c4fed6ed1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c94cbd262b6aa3b54d73a1ed1f9c0d19df57f4ffPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/587acad41f1bc48e16f42bb2aca63bf323380be8Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/bb851d0fb02547d03cd40106b5f2391c4fed6ed1Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c94cbd262b6aa3b54d73a1ed1f9c0d19df57f4ffPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/smc/smc_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c94cbd262b6aa3b54d73a1ed1f9c0d19df57f4ff",
              "status": "affected",
              "version": "cb9d43f6775457cac75544bc4197f26ac2b6f294",
              "versionType": "git"
            },
            {
              "lessThan": "bb851d0fb02547d03cd40106b5f2391c4fed6ed1",
              "status": "affected",
              "version": "cb9d43f6775457cac75544bc4197f26ac2b6f294",
              "versionType": "git"
            },
            {
              "lessThan": "587acad41f1bc48e16f42bb2aca63bf323380be8",
              "status": "affected",
              "version": "cb9d43f6775457cac75544bc4197f26ac2b6f294",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/smc/smc_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.18"
            },
            {
              "lessThan": "4.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.83",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.6",
              "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": "835BC6F8-85B4-4718-9DE2-261C7D68F1B4",
              "versionEndExcluding": "5.10.83",
              "versionStartIncluding": "4.18",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "990C08FB-0121-4296-896F-556312F8FF3B",
              "versionEndExcluding": "5.15.6",
              "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\nnet/smc: Fix NULL pointer dereferencing in smc_vlan_by_tcpsk()\n\nCoverity reports a possible NULL dereferencing problem:\n\nin smc_vlan_by_tcpsk():\n6. returned_null: netdev_lower_get_next returns NULL (checked 29 out of 30 times).\n7. var_assigned: Assigning: ndev = NULL return value from netdev_lower_get_next.\n1623                ndev = (struct net_device *)netdev_lower_get_next(ndev, \u0026lower);\nCID 1468509 (#1 of 1): Dereference null return value (NULL_RETURNS)\n8. dereference: Dereferencing a pointer that might be NULL ndev when calling is_vlan_dev.\n1624                if (is_vlan_dev(ndev)) {\n\nRemove the manual implementation and use netdev_walk_all_lower_dev() to\niterate over the lower devices. While on it remove an obsolete function\nparameter comment."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/smc: corrige la desreferenciaci\u00f3n del puntero NULL en smc_vlan_by_tcpsk() Coverity informa un posible problema de desreferenciaci\u00f3n de NULL: en smc_vlan_by_tcpsk(): 6. return_null: netdev_lower_get_next devuelve NULL (comprobado 29 de 30 veces). 7. var_assigned: Asignaci\u00f3n: ndev = valor de retorno NULL de netdev_lower_get_next. 1623 ndev = (struct net_device *)netdev_lower_get_next(ndev, \u0026amp;lower); CID 1468509 (#1 de 1): Desreferenciar valor de retorno nulo (NULL_RETURNS) 8. desreferencia: Desreferenciar un puntero que podr\u00eda ser NULL ndev al llamar a is_vlan_dev. 1624 if (is_vlan_dev(ndev)) { Elimine la implementaci\u00f3n manual y use netdev_walk_all_lower_dev() para iterar sobre los dispositivos inferiores. Mientras est\u00e9 en \u00e9l, elimine un comentario de par\u00e1metro de funci\u00f3n obsoleto."
    }
  ],
  "id": "CVE-2021-47559",
  "lastModified": "2026-08-04T10:17:08.870",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-47559",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-05-24T19:14:31.432418Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-05-24T15:15:20.537",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/587acad41f1bc48e16f42bb2aca63bf323380be8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/bb851d0fb02547d03cd40106b5f2391c4fed6ed1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/c94cbd262b6aa3b54d73a1ed1f9c0d19df57f4ff"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/587acad41f1bc48e16f42bb2aca63bf323380be8"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/bb851d0fb02547d03cd40106b5f2391c4fed6ed1"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/c94cbd262b6aa3b54d73a1ed1f9c0d19df57f4ff"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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