CVE-2016-6197

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dentry before proceeding with unlink and rename system-call processing, which allows local users to cause a denial of service (system crash) via a rename system call that specifies a self-hardlink."}, {"lang": "es", "value": "fs/overlayfs/dir.c en la implementaci\u00f3n del sistema de archivos OverlayFS en el kernel de Linux en versiones anteriores a 4.6 no verifica adecuadamente la dentry superior antes de proceder con el procesamiento de desconexi\u00f3n y cambio de nombre de llamadas al sistema, lo que permite a usuarios locales provocar una denegaci\u00f3n del servicio (ca\u00edda de sistema) a trav\u00e9s de una llamada al sistema cambiada de nombre que especifica un self-hardlink."}], "id": "CVE-2016-6197", "lastModified": "2026-06-17T00:50:37.223", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 4.9, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:C", "version": "2.0"}, "exploitabilityScore": 3.9, "impactScore": 6.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.0"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2016-08-06T20:59:12.067", "references": [{"source": "cve@mitre.org", "tags": ["Issue Tracking", "Patch"], "url": 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{"acknowledgement": "This issue was discovered by CAI Qian (Red Hat).", "affected_release": [{"advisory": "RHSA-2016:1875", "cpe": "cpe:/a:redhat:rhel_extras_rt:7", "package": "kernel-rt-0:3.10.0-327.36.1.rt56.237.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2016-09-15T00:00:00Z"}, {"advisory": "RHSA-2016:1847", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "kernel-0:3.10.0-327.36.1.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2016-09-15T00:00:00Z"}], "bugzilla": {"description": "kernel: overlayfs: missing upper dentry verification before unlink and rename", "id": "1355650", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1355650"}, "csaw": false, "cvss": {"cvss_base_score": "4.7", "cvss_scoring_vector": "AV:L/AC:M/Au:N/C:N/I:N/A:C", "status": "verified"}, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-362", "details": ["fs/overlayfs/dir.c in the OverlayFS filesystem implementation in the Linux kernel before 4.6 does not properly verify the upper dentry before proceeding with unlink and rename system-call processing, which allows local users to cause a denial of service (system crash) via a rename system call that specifies a self-hardlink.", "It was found that the unlink and rename functionality in overlayfs did not verify the upper dentry for staleness. A local, unprivileged user could use the rename syscall on overlayfs on top of xfs to panic or crash the system."], "name": "CVE-2016-6197", "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:/a:redhat:enterprise_mrg:2", "fix_state": "Affected", "package_name": "realtime-kernel", "product_name": "Red Hat Enterprise MRG 2"}], "public_date": "2016-07-11T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2016-6197\nhttps://nvd.nist.gov/vuln/detail/CVE-2016-6197"], "statement": "This issue is not present in the Linux kernel packages as shipped with Red Hat Enterprise Linux versions 5 and 6.\nThis issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG-2. Future Linux kernel updates for the respective releases may address this issue.", "threat_severity": "Moderate"}

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