CVE-2021-34981 (GCVE-0-2021-34981)

Vulnerability from cvelistv5 – Published: 2024-05-07 22:54 – Updated: 2024-08-04 00:26
VLAI?
Summary
Linux Kernel Bluetooth CMTP Module Double Free Privilege Escalation Vulnerability. This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel. An attacker must first obtain the ability to execute high-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the CMTP module. The issue results from the lack of validating the existence of an object prior to performing further free operations on the object. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of the kernel. Was ZDI-CAN-11977.
Severity ?
7.5 (High)
CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE
Assigner
zdi
References
Impacted products
Vendor Product Version
Linux Kernel Affected: 4.15.0-118-generic
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:linux:kernel:4.15.0-118-generic:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "kernel",
            "vendor": "linux",
            "versions": [
              {
                "status": "affected",
                "version": "4.15.0-118-generic"
              }
            ]
          }
        ],
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-34981",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-05-08T14:56:48.288493Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-06-04T17:12:51.708Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T00:26:55.716Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "ZDI-21-1223",
            "tags": [
              "x_research-advisory",
              "x_transferred"
            ],
            "url": "https://www.zerodayinitiative.com/advisories/ZDI-21-1223/"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "Kernel",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.15.0-118-generic"
            }
          ]
        }
      ],
      "dateAssigned": "2021-06-30T08:56:51.715-05:00",
      "datePublic": "2021-10-26T05:10:16.323-05:00",
      "descriptions": [
        {
          "lang": "en",
          "value": "Linux Kernel Bluetooth CMTP Module Double Free Privilege Escalation Vulnerability. This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel. An attacker must first obtain the ability to execute high-privileged code on the target system in order to exploit this vulnerability.\n\nThe specific flaw exists within the CMTP module. The issue results from the lack of validating the existence of an object prior to performing further free operations on the object. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of the kernel. Was ZDI-CAN-11977."
        }
      ],
      "metrics": [
        {
          "cvssV3_0": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.0"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-415",
              "description": "CWE-415: Double Free",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-05-07T22:54:49.205Z",
        "orgId": "99f1926a-a320-47d8-bbb5-42feb611262e",
        "shortName": "zdi"
      },
      "references": [
        {
          "name": "ZDI-21-1223",
          "tags": [
            "x_research-advisory"
          ],
          "url": "https://www.zerodayinitiative.com/advisories/ZDI-21-1223/"
        }
      ],
      "source": {
        "lang": "en",
        "value": "Ryota Shiga(@Ga_ryo_) of Flatt Security"
      },
      "title": "Linux Kernel Bluetooth CMTP Module Double Free Privilege Escalation Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "99f1926a-a320-47d8-bbb5-42feb611262e",
    "assignerShortName": "zdi",
    "cveId": "CVE-2021-34981",
    "datePublished": "2024-05-07T22:54:49.205Z",
    "dateReserved": "2021-06-17T19:27:05.661Z",
    "dateUpdated": "2024-08-04T00:26:55.716Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "fkie_nvd": {
      "descriptions": "[{\"lang\": \"en\", \"value\": \"Linux Kernel Bluetooth CMTP Module Double Free Privilege Escalation Vulnerability. This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel. An attacker must first obtain the ability to execute high-privileged code on the target system in order to exploit this vulnerability.\\n\\nThe specific flaw exists within the CMTP module. The issue results from the lack of validating the existence of an object prior to performing further free operations on the object. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of the kernel. Was ZDI-CAN-11977.\"}, {\"lang\": \"es\", \"value\": \"Vulnerabilidad de escalada de privilegios gratuita doble del m\\u00f3dulo CMTP Bluetooth del kernel de Linux. Esta vulnerabilidad permite a atacantes locales escalar privilegios en las instalaciones afectadas del kernel de Linux. Un atacante primero debe obtener la capacidad de ejecutar c\\u00f3digo con altos privilegios en el sistema de destino para poder explotar esta vulnerabilidad. La falla espec\\u00edfica existe dentro del m\\u00f3dulo CMTP. El problema surge de la falta de validaci\\u00f3n de la existencia de un objeto antes de realizar m\\u00e1s operaciones libres sobre el objeto. Un atacante puede aprovechar esta vulnerabilidad para escalar privilegios y ejecutar c\\u00f3digo en el contexto del kernel. Era ZDI-CAN-11977.\"}]",
      "id": "CVE-2021-34981",
      "lastModified": "2024-11-21T06:11:38.233",
      "metrics": "{\"cvssMetricV30\": [{\"source\": \"zdi-disclosures@trendmicro.com\", \"type\": \"Secondary\", \"cvssData\": {\"version\": \"3.0\", \"vectorString\": \"CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H\", \"baseScore\": 7.5, \"baseSeverity\": \"HIGH\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"HIGH\", \"privilegesRequired\": \"HIGH\", \"userInteraction\": \"NONE\", \"scope\": \"CHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 0.8, \"impactScore\": 6.0}]}",
      "published": "2024-05-07T23:15:13.173",
      "references": "[{\"url\": \"https://www.zerodayinitiative.com/advisories/ZDI-21-1223/\", \"source\": \"zdi-disclosures@trendmicro.com\"}, {\"url\": \"https://www.zerodayinitiative.com/advisories/ZDI-21-1223/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}]",
      "sourceIdentifier": "zdi-disclosures@trendmicro.com",
      "vulnStatus": "Awaiting Analysis",
      "weaknesses": "[{\"source\": \"zdi-disclosures@trendmicro.com\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-415\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-34981\",\"sourceIdentifier\":\"zdi-disclosures@trendmicro.com\",\"published\":\"2024-05-07T23:15:13.173\",\"lastModified\":\"2025-08-14T01:42:25.163\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Linux Kernel Bluetooth CMTP Module Double Free Privilege Escalation Vulnerability. This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel. An attacker must first obtain the ability to execute high-privileged code on the target system in order to exploit this vulnerability.\\n\\nThe specific flaw exists within the CMTP module. The issue results from the lack of validating the existence of an object prior to performing further free operations on the object. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of the kernel. Was ZDI-CAN-11977.\"},{\"lang\":\"es\",\"value\":\"Vulnerabilidad de escalada de privilegios gratuita doble del m\u00f3dulo CMTP Bluetooth del kernel de Linux. Esta vulnerabilidad permite a atacantes locales escalar privilegios en las instalaciones afectadas del kernel de Linux. Un atacante primero debe obtener la capacidad de ejecutar c\u00f3digo con altos privilegios en el sistema de destino para poder explotar esta vulnerabilidad. La falla espec\u00edfica existe dentro del m\u00f3dulo CMTP. El problema surge de la falta de validaci\u00f3n de la existencia de un objeto antes de realizar m\u00e1s operaciones libres sobre el objeto. Un atacante puede aprovechar esta vulnerabilidad para escalar privilegios y ejecutar c\u00f3digo en el contexto del kernel. Era ZDI-CAN-11977.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":6.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":0.8,\"impactScore\":5.9}],\"cvssMetricV30\":[{\"source\":\"zdi-disclosures@trendmicro.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.0\",\"vectorString\":\"CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":0.8,\"impactScore\":6.0}]},\"weaknesses\":[{\"source\":\"zdi-disclosures@trendmicro.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-415\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"5.10.42\",\"matchCriteriaId\":\"582C74A2-7C5A-40C2-A454-AD25DFDA786D\"}]}]}],\"references\":[{\"url\":\"https://www.zerodayinitiative.com/advisories/ZDI-21-1223/\",\"source\":\"zdi-disclosures@trendmicro.com\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.zerodayinitiative.com/advisories/ZDI-21-1223/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://www.zerodayinitiative.com/advisories/ZDI-21-1223/\", \"name\": \"ZDI-21-1223\", \"tags\": [\"x_research-advisory\", \"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T00:26:55.716Z\"}}, {\"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-34981\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-05-08T14:56:48.288493Z\"}}}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:linux:kernel:4.15.0-118-generic:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"kernel\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.15.0-118-generic\"}], \"defaultStatus\": \"unknown\"}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-08T15:03:01.785Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"title\": \"Linux Kernel Bluetooth CMTP Module Double Free Privilege Escalation Vulnerability\", \"source\": {\"lang\": \"en\", \"value\": \"Ryota Shiga(@Ga_ryo_) of Flatt Security\"}, \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_0\": {\"version\": \"3.0\", \"baseScore\": 7.5, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H\"}}], \"affected\": [{\"vendor\": \"Linux\", \"product\": \"Kernel\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.15.0-118-generic\"}], \"defaultStatus\": \"unknown\"}], \"datePublic\": \"2021-10-26T05:10:16.323-05:00\", \"references\": [{\"url\": \"https://www.zerodayinitiative.com/advisories/ZDI-21-1223/\", \"name\": \"ZDI-21-1223\", \"tags\": [\"x_research-advisory\"]}], \"dateAssigned\": \"2021-06-30T08:56:51.715-05:00\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"Linux Kernel Bluetooth CMTP Module Double Free Privilege Escalation Vulnerability. This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel. An attacker must first obtain the ability to execute high-privileged code on the target system in order to exploit this vulnerability.\\n\\nThe specific flaw exists within the CMTP module. The issue results from the lack of validating the existence of an object prior to performing further free operations on the object. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of the kernel. Was ZDI-CAN-11977.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-415\", \"description\": \"CWE-415: Double Free\"}]}], \"providerMetadata\": {\"orgId\": \"99f1926a-a320-47d8-bbb5-42feb611262e\", \"shortName\": \"zdi\", \"dateUpdated\": \"2024-05-07T22:54:49.205Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-34981\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-08-04T00:26:55.716Z\", \"dateReserved\": \"2021-06-17T19:27:05.661Z\", \"assignerOrgId\": \"99f1926a-a320-47d8-bbb5-42feb611262e\", \"datePublished\": \"2024-05-07T22:54:49.205Z\", \"assignerShortName\": \"zdi\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.