FKIE_CVE-2021-33033

Vulnerability from fkie_nvd - Published: 2021-05-14 23:15 - Updated: 2026-08-05 18:35
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled, aka CID-ad5d07f4a9cd. This leads to writing an arbitrary value.
References
cve@mitre.orghttps://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.14Mailing List, Patch, Vendor Advisory
cve@mitre.orghttps://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.7Mailing List, Patch, Vendor Advisory
cve@mitre.orghttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1165affd484889d4986cf3b724318935a0b120d8Mailing List, Patch, Vendor Advisory
cve@mitre.orghttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad5d07f4a9cd671233ae20983848874731102c08Mailing List, Patch, Vendor Advisory
cve@mitre.orghttps://sites.google.com/view/syzscope/kasan-use-after-free-read-in-cipso_v4_genoptExploit, Third Party Advisory
cve@mitre.orghttps://syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701eExploit, Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.14Mailing List, Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.7Mailing List, Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1165affd484889d4986cf3b724318935a0b120d8Mailing List, Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad5d07f4a9cd671233ae20983848874731102c08Mailing List, Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-cipso_v4_genoptExploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701eExploit, Mailing List, Third Party Advisory
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "4A374D86-5FE7-4CC7-BDA1-52E8E8B4E2B8",
              "versionEndExcluding": "4.9.298",
              "versionStartIncluding": "2.6.28",
              "vulnerable": true
            },
            {
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            },
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              "versionEndExcluding": "5.10.24",
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              "vulnerable": true
            },
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              "versionEndExcluding": "5.11.7",
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              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled, aka CID-ad5d07f4a9cd. This leads to writing an arbitrary value."
    },
    {
      "lang": "es",
      "value": "El kernel de Linux versiones anteriores a 5.11.14, presenta un uso de la memoria previamente liberada en una funci\u00f3n cipso_v4_genopt en el archivo net/ipv4/cipso_ipv4.c, porque el recuento de CIPSO y CALIPSO para las definiciones DOI es manejado inapropiadamente, tambi\u00e9n se conoce como CID-ad5d07f4a9cd.\u0026#xa0;Esto conlleva a escribir un valor arbitrario"
    }
  ],
  "id": "CVE-2021-33033",
  "lastModified": "2026-08-05T18:35:52.210",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 4.6,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "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"
      }
    ]
  },
  "published": "2021-05-14T23:15:09.780",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
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      ],
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    },
    {
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    },
    {
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    },
    {
      "source": "cve@mitre.org",
      "tags": [
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      "url": "https://syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701e"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
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    },
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  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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