CVE-2021-34981

{"id": "CVE-2021-34981", "cveTags": [], "metrics": {"cvssMetricV30": [{"type": "Secondary", "source": "zdi-disclosures@trendmicro.com", "cvssData": {"scope": "CHANGED", "version": "3.0", "baseScore": 7.5, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "HIGH", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 0.8}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.7, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "HIGH", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 0.8}]}, "published": "2024-05-07T23:15:13.173", "references": [{"url": "https://www.zerodayinitiative.com/advisories/ZDI-21-1223/", "tags": ["Third Party Advisory"], "source": "zdi-disclosures@trendmicro.com"}, {"url": "https://www.zerodayinitiative.com/advisories/ZDI-21-1223/", "tags": ["Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "zdi-disclosures@trendmicro.com", "description": [{"lang": "en", "value": "CWE-415"}]}], "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."}], "lastModified": "2025-08-14T01:42:25.163", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "582C74A2-7C5A-40C2-A454-AD25DFDA786D", "versionEndExcluding": "5.10.42"}], "operator": "OR"}]}], "sourceIdentifier": "zdi-disclosures@trendmicro.com"}