CVE-2019-20934

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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": "F110373F-D796-47EF-9141-EA0D75486058", "versionEndExcluding": "4.19.64", "versionStartIncluding": "4.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "DF5131E1-24E0-448E-A510-C7BF53F209A5", "versionEndIncluding": "5.2.17", "versionStartIncluding": "5.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.3:rc1:*:*:*:*:*:*", "matchCriteriaId": "9E57A227-1EC1-4E47-AE4E-CCD42CAA4710", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "An issue was discovered in the Linux kernel before 5.2.6. On NUMA systems, the Linux fair scheduler has a use-after-free in show_numa_stats() because NUMA fault statistics are inappropriately freed, aka CID-16d51a590a8c."}, {"lang": "es", "value": "Se detect\u00f3 un problema en el kernel de Linux versiones anteriores a 5.2.6. En los sistemas NUMA, el programador fair de Linux presenta un uso de la memoria previamente liberada en la funci\u00f3n show_numa_stats() porque las estad\u00edsticas de fallo de NUMA son liberadas inapropiadamente, tambi\u00e9n se conoce como CID-16d51a590a8c"}], "id": "CVE-2019-20934", "lastModified": "2026-06-17T02:31:27.330", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 5.4, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:L/AC:M/Au:N/C:P/I:N/A:C", "version": "2.0"}, "exploitabilityScore": 3.4, "impactScore": 7.8, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 4.2, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2020-11-28T07:15:11.037", "references": [{"source": "cve@mitre.org", "tags": ["Issue Tracking", "Vendor Advisory"], "url": "https://bugs.chromium.org/p/project-zero/issues/detail?id=1913"}, {"source": "cve@mitre.org", "tags": ["Vendor Advisory"], "url": "https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2.6"}, {"source": "cve@mitre.org", "tags": ["Patch", "Vendor Advisory"], "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=16d51a590a8ce3befb1308e0e7ab77f3b661af33"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Vendor Advisory"], "url": "https://bugs.chromium.org/p/project-zero/issues/detail?id=1913"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2.6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Vendor Advisory"], "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=16d51a590a8ce3befb1308e0e7ab77f3b661af33"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2021:2726", "cpe": "cpe:/a:redhat:rhel_extras_rt:7", "package": "kernel-rt-0:3.10.0-1160.36.2.rt56.1179.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2021-07-21T00:00:00Z"}, {"advisory": "RHSA-2021:2725", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "kernel-0:3.10.0-1160.36.2.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2021-07-21T00:00:00Z"}, {"advisory": "RHSA-2021:3987", "cpe": "cpe:/o:redhat:rhel_aus:7.7", "package": "kernel-0:3.10.0-1062.59.1.el7", "product_name": "Red Hat Enterprise Linux 7.7 Advanced Update Support", "release_date": "2021-10-26T00:00:00Z"}, {"advisory": "RHSA-2021:3987", "cpe": "cpe:/o:redhat:rhel_tus:7.7", "package": "kernel-0:3.10.0-1062.59.1.el7", "product_name": "Red Hat Enterprise Linux 7.7 Telco Extended Update Support", "release_date": "2021-10-26T00:00:00Z"}, {"advisory": "RHSA-2021:3987", "cpe": "cpe:/o:redhat:rhel_e4s:7.7", "package": "kernel-0:3.10.0-1062.59.1.el7", "product_name": "Red Hat Enterprise Linux 7.7 Update Services for SAP Solutions", "release_date": "2021-10-26T00:00:00Z"}], "bugzilla": {"description": "kernel: use-after-free in show_numa_stats function", "id": "1902788", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1902788"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H", "status": "verified"}, "cwe": "CWE-416", "details": ["An issue was discovered in the Linux kernel before 5.2.6. On NUMA systems, the Linux fair scheduler has a use-after-free in show_numa_stats() because NUMA fault statistics are inappropriately freed, aka CID-16d51a590a8c.", "A flaw was found in the Linux kernel\u2019s implementation of displaying NUMA statistics, where displaying the scheduler statistics could trigger a use-after-free in show_numa_stats() and display the kernel memory to userspace. The highest threat from this vulnerability is to system availability."], "mitigation": {"lang": "en:us", "value": "As the NUMA features are built-in and enabled by default, the NUMA functionality can be disabled at boot time by providing the kernel parameter, numa=off.\nThe method of providing this parameter depends on the operating system version, see KCS article https://access.redhat.com/solutions/23216.\nDisabling this feature may have significant performance impacts and the administrator should consider if the performance penalty is a problem.\nIf you need further assistance, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services."}, "name": "CVE-2019-20934", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "kernel-alt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}], "public_date": "2020-07-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2019-20934\nhttps://nvd.nist.gov/vuln/detail/CVE-2019-20934"], "threat_severity": "Moderate"}

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