CVE-2020-27820

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kernel de Linux, en la que un uso de memoria previamente liberada en el manejador postclose() de nouveau podr\u00eda ocurrir si se quita el dispositivo (que no es com\u00fan quitar la tarjeta de v\u00eddeo f\u00edsicamente sin apagar, pero lo mismo ocurre si se \"desvincula\" el controlador)"}], "id": "CVE-2020-27820", "lastModified": "2026-06-17T03:09:40.923", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 4.7, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:L/AC:M/Au:N/C:N/I:N/A:C", "version": "2.0"}, "exploitabilityScore": 3.4, "impactScore": 6.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-11-03T00:15:07.550", "references": [{"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1901726"}, {"source": "secalert@redhat.com", "tags": ["Mailing List", "Vendor Advisory"], "url": "https://lore.kernel.org/dri-devel/20201103194912.184413-2-jcline%40redhat.com/"}, {"source": "secalert@redhat.com", "tags": ["Mailing List", "Vendor Advisory"], "url": "https://lore.kernel.org/dri-devel/20201103194912.184413-3-jcline%40redhat.com/"}, {"source": "secalert@redhat.com", 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{"acknowledgement": "This issue was discovered by Jeremy Cline (Red Hat).", "affected_release": [{"advisory": "RHSA-2022:1975", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-372.9.1.rt7.166.el8", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-05-10T00:00:00Z"}, {"advisory": "RHSA-2022:1988", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-372.9.1.el8", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-05-10T00:00:00Z"}], "bugzilla": {"description": "kernel: use-after-free in nouveau kernel module", "id": "1901726", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1901726"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-416", "details": ["A vulnerability was found in Linux kernel, where a use-after-frees in nouveau's postclose() handler could happen if removing device (that is not common to remove video card physically without power-off, but same happens if \"unbind\" the driver).", "A vulnerability was found in Linux kernel, where a use-after-frees in nouveau's postclose() handler could happen if removing device (that is not common to remove video card physically without power-off, but same happens if \"unbind\" the driver)."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, prevent the module nouveau from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to blacklist a kernel module to prevent it from loading automatically."}, "name": "CVE-2020-27820", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-alt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:enterprise_mrg:2", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise MRG 2"}], "public_date": "2020-11-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-27820\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-27820\nhttps://lore.kernel.org/dri-devel/20201103194912.184413-2-jcline@redhat.com/\nhttps://lore.kernel.org/dri-devel/20201103194912.184413-3-jcline@redhat.com/\nhttps://lore.kernel.org/dri-devel/20201103194912.184413-4-jcline@redhat.com/"], "statement": "This flaw is rated as having a Low impact because the issue can only be triggered by an privileged local user (or user with physical access) as the issue only happens during unbinding the driver or removing the device.", "threat_severity": "Low"}

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