FKIE_CVE-2021-47186

Vulnerability from fkie_nvd - Published: 2024-04-10 19:15 - Updated: 2026-06-17 04:16
Severity
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: tipc: check for null after calling kmemdup kmemdup can return a null pointer so need to check for it, otherwise the null key will be dereferenced later in tipc_crypto_key_xmit as can be seen in the trace [1]. [1] https://syzkaller.appspot.com/bug?id=bca180abb29567b189efdbdb34cbf7ba851c2a58
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3e6db079751afd527bf3db32314ae938dc571916Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9404c4145542c23019a80ab1bb2ecf73cd057b10Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a7d91625863d4ffed63b993b5e6dc1298b6430c9Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3e6db079751afd527bf3db32314ae938dc571916Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9404c4145542c23019a80ab1bb2ecf73cd057b10Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a7d91625863d4ffed63b993b5e6dc1298b6430c9Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.16
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/tipc/crypto.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a7d91625863d4ffed63b993b5e6dc1298b6430c9",
              "status": "affected",
              "version": "1ef6f7c9390ff5308c940ff8d0a53533a4673ad9",
              "versionType": "git"
            },
            {
              "lessThan": "9404c4145542c23019a80ab1bb2ecf73cd057b10",
              "status": "affected",
              "version": "1ef6f7c9390ff5308c940ff8d0a53533a4673ad9",
              "versionType": "git"
            },
            {
              "lessThan": "3e6db079751afd527bf3db32314ae938dc571916",
              "status": "affected",
              "version": "1ef6f7c9390ff5308c940ff8d0a53533a4673ad9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/tipc/crypto.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.10"
            },
            {
              "lessThan": "5.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.82",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unknown",
          "product": "linux_kernel",
          "vendor": "linux",
          "versions": [
            {
              "lessThan": "a7d91625863d",
              "status": "affected",
              "version": "1da177e4c3f4",
              "versionType": "custom"
            },
            {
              "lessThan": "9404c4145542",
              "status": "affected",
              "version": "1da177e4c3f4",
              "versionType": "custom"
            },
            {
              "lessThan": "3e6db079751a",
              "status": "affected",
              "version": "1da177e4c3f4",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "5.11",
              "status": "unaffected",
              "version": "5.10.82",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "5.16",
              "status": "unaffected",
              "version": "5.15.5",
              "versionType": "custom"
            },
            {
              "status": "unaffected",
              "version": "5.16"
            }
          ]
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "AE501832-500C-4EF1-9489-5C13674F619D",
              "versionEndExcluding": "5.10.82",
              "versionStartIncluding": "5.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2128A085-4C0C-4C1E-9E9C-0DD868E2170F",
              "versionEndExcluding": "5.15.5",
              "versionStartIncluding": "5.11",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "357AA433-37E8-4323-BFB2-3038D6E4B414",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: check for null after calling kmemdup\n\nkmemdup can return a null pointer so need to check for it, otherwise\nthe null key will be dereferenced later in tipc_crypto_key_xmit as\ncan be seen in the trace [1].\n\n\n[1] https://syzkaller.appspot.com/bug?id=bca180abb29567b189efdbdb34cbf7ba851c2a58"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: tipc: verifique si hay valores nulos despu\u00e9s de llamar a kmemdup kmemdup puede devolver un puntero nulo, por lo que es necesario verificarlo; de lo contrario, se eliminar\u00e1 la referencia a la clave nula m\u00e1s adelante en tipc_crypto_key_xmit, como se puede ver en el seguimiento. [1]. [1] https://syzkaller.appspot.com/bug?id=bca180abb29567b189efdbdb34cbf7ba851c2a58"
    }
  ],
  "id": "CVE-2021-47186",
  "lastModified": "2026-06-17T04:16:51.793",
  "metrics": {
    "cvssMetricV31": [
      {
        "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-2021-47186",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-04-15T14:53:12.521984Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-04-10T19:15:47.430",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3e6db079751afd527bf3db32314ae938dc571916"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/9404c4145542c23019a80ab1bb2ecf73cd057b10"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/a7d91625863d4ffed63b993b5e6dc1298b6430c9"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3e6db079751afd527bf3db32314ae938dc571916"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/9404c4145542c23019a80ab1bb2ecf73cd057b10"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/a7d91625863d4ffed63b993b5e6dc1298b6430c9"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "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.

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