CVE-2021-20219

{"id": "CVE-2021-20219", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 2.1, "accessVector": "LOCAL", "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:P", "authentication": "NONE", "integrityImpact": "NONE", "accessComplexity": "LOW", "availabilityImpact": "PARTIAL", "confidentialityImpact": "NONE"}, "acInsufInfo": false, "impactScore": 2.9, "baseSeverity": "LOW", "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": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2021-03-23T17:15:13.607", "references": [{"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1923738", "tags": ["Issue Tracking", "Third Party Advisory"], "source": "secalert@redhat.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "secalert@redhat.com", "description": [{"lang": "en", "value": "CWE-697"}]}], "descriptions": [{"lang": "en", "value": "A denial of service vulnerability was found in n_tty_receive_char_special in drivers/tty/n_tty.c of the Linux kernel. In this flaw a local attacker with a normal user privilege could delay the loop (due to a changing ldata->read_head, and a missing sanity check) and cause a threat to the system availability."}, {"lang": "es", "value": "Se encontr\u00f3 una vulnerabilidad de denegaci\u00f3n de servicio en la funci\u00f3n n_tty_receive_char_special en el archivo drivers/tty/n_tty.c del kernel de Linux. En este fallo, un atacante local con un privilegio de usuario normal podr\u00eda retrasar el ciclo (debido a un cambio de ldata-)read_head, y una falta de comprobaci\u00f3n de saneamiento) y causar una amenaza a la disponibilidad del sistema"}], "lastModified": "2021-03-26T19:48:33.537", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3249552B-A101-45A3-9F46-0E0F0BDBA9E3", "versionEndExcluding": "4.18"}], "operator": "OR"}]}], "sourceIdentifier": "secalert@redhat.com"}