CVE-2021-3492

{"id": "CVE-2021-3492", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 7.2, "accessVector": "LOCAL", "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "authentication": "NONE", "integrityImpact": "COMPLETE", "accessComplexity": "LOW", "availabilityImpact": "COMPLETE", "confidentialityImpact": "COMPLETE"}, "acInsufInfo": false, "impactScore": 10.0, "baseSeverity": "HIGH", "obtainAllPrivilege": false, "exploitabilityScore": 3.9, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}, {"type": "Secondary", "source": "security@ubuntu.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 2.0}]}, "published": "2021-04-17T05:15:13.113", "references": [{"url": "http://packetstormsecurity.com/files/162614/Kernel-Live-Patch-Security-Notice-LSN-0077-1.html", "tags": ["Third Party Advisory", "VDB Entry"], "source": "security@ubuntu.com"}, {"url": "https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=25c891a949bf918b59cbc6e4932015ba4c35c333", "tags": ["Mailing List", "Patch", "Vendor Advisory"], "source": "security@ubuntu.com"}, {"url": "https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=8fee52ab9da87d82bc6de9ebb3480fff9b4d53e6", "tags": ["Mailing List", "Patch", "Vendor Advisory"], "source": "security@ubuntu.com"}, {"url": "https://ubuntu.com/security/notices/USN-4917-1", "tags": ["Vendor Advisory"], "source": "security@ubuntu.com"}, {"url": "https://www.openwall.com/lists/oss-security/2021/04/16/2", "tags": ["Mailing List", "Third Party Advisory"], "source": "security@ubuntu.com"}, {"url": "https://www.zerodayinitiative.com/advisories/ZDI-21-422/", "tags": ["Third Party Advisory", "VDB Entry"], "source": "security@ubuntu.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-401"}, {"lang": "en", "value": "CWE-415"}]}, {"type": "Secondary", "source": "security@ubuntu.com", "description": [{"lang": "en", "value": "CWE-401"}, {"lang": "en", "value": "CWE-415"}]}], "descriptions": [{"lang": "en", "value": "Shiftfs, an out-of-tree stacking file system included in Ubuntu Linux kernels, did not properly handle faults occurring during copy_from_user() correctly. These could lead to either a double-free situation or memory not being freed at all. An attacker could use this to cause a denial of service (kernel memory exhaustion) or gain privileges via executing arbitrary code. AKA ZDI-CAN-13562."}, {"lang": "es", "value": "Shiftfs, un sistema de archivos de apilamiento fuera del \u00e1rbol incluido en los kernels de Ubuntu Linux, no manejaba apropiadamente los fallos que ocurr\u00edan durante la funci\u00f3n copy_from_user(). Esto podr\u00eda conllevar a una situaci\u00f3n de doble liberaci\u00f3n o a que la memoria no sea liberada del todo. Un atacante podr\u00eda usar esto para causar una denegaci\u00f3n de servicio (agotamiento de la memoria del kernel) u alcanzar privilegios por medio de la ejecuci\u00f3n de c\u00f3digo arbitrario. Tambi\u00e9n se conoce como ZDI-CAN-13562"}], "lastModified": "2021-05-21T16:08:32.527", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:lts:*:*:*", "vulnerable": true, "matchCriteriaId": "90A80DE7-3EFA-464C-9D31-C46521FFBFBF", "versionEndExcluding": "18.04"}, {"criteria": "cpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:lts:*:*:*", "vulnerable": true, "matchCriteriaId": "2027773B-26DA-408E-B71D-40D05690D9EA", "versionEndExcluding": "20.04", "versionStartIncluding": "18.04.1"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:-:*:*:*", "vulnerable": true, "matchCriteriaId": "ACAB2EE0-EC21-4669-840F-94F6C3028C64", "versionEndExcluding": "20.10"}], "operator": "OR"}]}], "sourceIdentifier": "security@ubuntu.com"}