CVE-2016-6213

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "3C328078-DE6F-4775-B855-1B0759412F43", "versionEndIncluding": "4.8.15", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "fs/namespace.c in the Linux kernel before 4.9 does not restrict how many mounts may exist in a mount namespace, which allows local users to cause a denial of service (memory consumption and deadlock) via MS_BIND mount system calls, as demonstrated by a loop that triggers exponential growth in the number of mounts."}, {"lang": "es", "value": "fs/namespace.c en el kernel de Linux en versiones anteriores a 4.9 no restringe la cantidad de montajes que pueden existir en un espacio de nombre del montaje, lo que permite a usuarios locales provocar una denegaci\u00f3n de servicio (consumo de memoria y punto muerto) a trav\u00e9s de llamadas al sistema de montaje MS_BIND, seg\u00fan lo demostrado por un bucle que desencadena un crecimiento exponencial en el n\u00famero de montajes."}], "id": "CVE-2016-6213", "lastModified": "2026-06-17T00:50:38.700", "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}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.0"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2016-12-28T07:59:00.180", "references": [{"source": "cve@mitre.org", "tags": ["Patch", "Vendor Advisory"], "url": "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d29216842a85c7970c536108e093963f02714498"}, {"source": "cve@mitre.org", "tags": ["Mailing List"], "url": "http://www.openwall.com/lists/oss-security/2016/07/13/8"}, {"source": "cve@mitre.org", "url": "http://www.securityfocus.com/bid/91754"}, {"source": "cve@mitre.org", "url": "https://access.redhat.com/errata/RHSA-2017:1842"}, {"source": "cve@mitre.org", "url": "https://access.redhat.com/errata/RHSA-2017:2077"}, {"source": "cve@mitre.org", "tags": ["Issue Tracking"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1356471"}, {"source": "cve@mitre.org", "tags": ["Patch"], "url": "https://github.com/torvalds/linux/commit/d29216842a85c7970c536108e093963f02714498"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Vendor Advisory"], "url": "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d29216842a85c7970c536108e093963f02714498"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List"], "url": "http://www.openwall.com/lists/oss-security/2016/07/13/8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.securityfocus.com/bid/91754"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://access.redhat.com/errata/RHSA-2017:1842"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://access.redhat.com/errata/RHSA-2017:2077"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1356471"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://github.com/torvalds/linux/commit/d29216842a85c7970c536108e093963f02714498"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "This issue was discovered by Qian Cai (Red Hat).", "affected_release": [{"advisory": "RHSA-2017:2077", "cpe": "cpe:/a:redhat:rhel_extras_rt:7", "package": "kernel-rt-0:3.10.0-693.rt56.617.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2017-08-01T00:00:00Z"}, {"advisory": "RHSA-2017:1842", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "kernel-0:3.10.0-693.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2017-08-01T00:00:00Z"}], "bugzilla": {"description": "kernel: Overflowing kernel mount table using shared bind mount", "id": "1356471", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1356471"}, "csaw": false, "cvss": {"cvss_base_score": "4.0", "cvss_scoring_vector": "AV:L/AC:H/Au:N/C:N/I:N/A:C", "status": "verified"}, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-770", "details": ["fs/namespace.c in the Linux kernel before 4.9 does not restrict how many mounts may exist in a mount namespace, which allows local users to cause a denial of service (memory consumption and deadlock) via MS_BIND mount system calls, as demonstrated by a loop that triggers exponential growth in the number of mounts.", "It was found that in Linux kernel the mount table expands by a power-of-two with each bind mount command. If a system is configured to allow non-privileged user to do bind mounts, or allows to do so in a container or unprivileged mount namespace, then non-privileged user is able to cause a local DoS by overflowing the mount table, which causes a deadlock for the whole system."], "name": "CVE-2016-6213", "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": "Not affected", "package_name": "realtime-kernel", "product_name": "Red Hat Enterprise MRG 2"}], "public_date": "2016-07-13T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2016-6213\nhttps://nvd.nist.gov/vuln/detail/CVE-2016-6213"], "statement": "This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, 7 and MRG-2 as of now due to the absence of unprivileged mount name spaces support.\nNevertheless, the unprivileged mount name spaces might be added to a future RHEL-7 version as a supported feature, so future Linux kernel updates for the respective releases might address this issue.", "threat_severity": "Low"}

{}