CVE-2023-52942

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As a result, it is possible to leave parent with no\neffective cpu left even if there are tasks in the parent cpuset. This\ncan lead to system panic as reported in [1].\n\nFix this probem by updating the check to fail the enabling the partition\nif parent's effective_cpus is a subset of the child's cpus_allowed.\n\nAlso record the error code when an error happens in update_prstate()\nand add a test case where parent partition and child have the same cpu\nlist and parent has task. Enabling partition in the child will fail in\nthis case.\n\n[1] https://www.spinics.net/lists/cgroups/msg36254.html"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: cgroup/cpuset: Correcci\u00f3n de una comprobaci\u00f3n incorrecta en update_parent_subparts_cpumask(). Se detect\u00f3 que la comprobaci\u00f3n para ver si una partici\u00f3n pod\u00eda usar todas las CPU del conjunto de CPU principal en update_parent_subparts_cpumask() era incorrecta. Como resultado, es posible dejar la partici\u00f3n principal sin CPU efectiva, incluso si hay tareas en el conjunto de CPU principal. Esto puede provocar un p\u00e1nico del sistema, como se informa en [1]. Corrija este problema actualizando la comprobaci\u00f3n para que falle al habilitar la partici\u00f3n si el valor de CPU efectivas de la partici\u00f3n principal es un subconjunto del valor de CPU permitidas de la partici\u00f3n secundaria. Tambi\u00e9n registre el c\u00f3digo de error cuando se produce un error en update_prstate() y agregue un caso de prueba donde la partici\u00f3n principal y la secundaria tengan la misma lista de CPU y la partici\u00f3n principal tenga una tarea. En este caso, la habilitaci\u00f3n de la partici\u00f3n en la secundaria fallar\u00e1. [1] https://www.spinics.net/lists/cgroups/msg36254.html"}], "id": "CVE-2023-52942", "lastModified": "2026-11-05T21:17:06.017", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-52942", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T20:13:59.225297Z", "version": "2.0.3"}}]}, "published": "2025-03-27T17:15:44.163", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a2ab7f2cf5ef8f0c6212a246e681d1fe358cec1f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e5ae8803847b80fe9d744a3174abe2b7bfed222a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: cgroup/cpuset: Fix wrong check in update_parent_subparts_cpumask()", "id": "2355498", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2355498"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncgroup/cpuset: Fix wrong check in update_parent_subparts_cpumask()\nIt was found that the check to see if a partition could use up all\nthe cpus from the parent cpuset in update_parent_subparts_cpumask()\nwas incorrect. As a result, it is possible to leave parent with no\neffective cpu left even if there are tasks in the parent cpuset. This\ncan lead to system panic as reported in [1].\nFix this probem by updating the check to fail the enabling the partition\nif parent's effective_cpus is a subset of the child's cpus_allowed.\nAlso record the error code when an error happens in update_prstate()\nand add a test case where parent partition and child have the same cpu\nlist and parent has task. Enabling partition in the child will fail in\nthis case.\n[1] https://www.spinics.net/lists/cgroups/msg36254.html"], "name": "CVE-2023-52942", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-03-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-52942\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-52942\nhttps://lore.kernel.org/linux-cve-announce/2025032723-CVE-2023-52942-6a3c@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-07-12T16:01:37.251243+00:00", "updated": "2025-07-12T16:01:37.251309+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}