CVE-2022-50103

{"id": "CVE-2022-50103", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 1.8}]}, "published": "2025-06-18T11:15:39.670", "references": [{"url": "https://git.kernel.org/stable/c/147f66d22f58712dce7ccdd6a1f6cb3ee8042df4", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/336626564b58071b8980a4e6a31a8f5d92705d9b", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/357f3f0e522a6ce1ce4a571cb780d9861d53bec7", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b6e8d40d43ae4dec00c8fea2593eeea3114b8f44", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/f56607b44c9896e51678a7e8cdd3a5479f4b4548", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-125"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched, cpuset: Fix dl_cpu_busy() panic due to empty cs->cpus_allowed\n\nWith cgroup v2, the cpuset's cpus_allowed mask can be empty indicating\nthat the cpuset will just use the effective CPUs of its parent. So\ncpuset_can_attach() can call task_can_attach() with an empty mask.\nThis can lead to cpumask_any_and() returns nr_cpu_ids causing the call\nto dl_bw_of() to crash due to percpu value access of an out of bound\nCPU value. For example:\n\n\t[80468.182258] BUG: unable to handle page fault for address: ffffffff8b6648b0\n\t :\n\t[80468.191019] RIP: 0010:dl_cpu_busy+0x30/0x2b0\n\t :\n\t[80468.207946] Call Trace:\n\t[80468.208947] cpuset_can_attach+0xa0/0x140\n\t[80468.209953] cgroup_migrate_execute+0x8c/0x490\n\t[80468.210931] cgroup_update_dfl_csses+0x254/0x270\n\t[80468.211898] cgroup_subtree_control_write+0x322/0x400\n\t[80468.212854] kernfs_fop_write_iter+0x11c/0x1b0\n\t[80468.213777] new_sync_write+0x11f/0x1b0\n\t[80468.214689] vfs_write+0x1eb/0x280\n\t[80468.215592] ksys_write+0x5f/0xe0\n\t[80468.216463] do_syscall_64+0x5c/0x80\n\t[80468.224287] entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nFix that by using effective_cpus instead. For cgroup v1, effective_cpus\nis the same as cpus_allowed. For v2, effective_cpus is the real cpumask\nto be used by tasks within the cpuset anyway.\n\nAlso update task_can_attach()'s 2nd argument name to cs_effective_cpus to\nreflect the change. In addition, a check is added to task_can_attach()\nto guard against the possibility that cpumask_any_and() may return a\nvalue >= nr_cpu_ids."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sched, cpuset: Se solucion\u00f3 el p\u00e1nico de dl_cpu_busy() debido a un valor de cs->cpus_allowed vac\u00edo. Con cgroup v2, la m\u00e1scara cpus_allowed de cpuset puede estar vac\u00eda, lo que indica que solo usar\u00e1 las CPU efectivas de su padre. Por lo tanto, cpuset_can_attach() puede llamar a task_can_attach() con una m\u00e1scara vac\u00eda. Esto puede provocar que cpumask_any_and() devuelva nr_cpu_ids, lo que provoca el bloqueo de la llamada a dl_bw_of() debido al acceso a un valor de CPU fuera de los l\u00edmites. Por ejemplo: [80468.182258] ERROR: no se puede manejar el error de p\u00e1gina para la direcci\u00f3n: ffffffff8b6648b0 : [80468.191019] RIP: 0010:dl_cpu_busy+0x30/0x2b0 : [80468.207946] Rastreo de llamadas: [80468.208947] cpuset_can_attach+0xa0/0x140 [80468.209953] cgroup_migrate_execute+0x8c/0x490 [80468.210931] cgroup_update_dfl_csses+0x254/0x270 [80468.211898] Solucione esto utilizando effective_cpus en su lugar. Para cgroup v1, effective_cpus es igual que cpus_allowed. Para v2, effective_cpus es la m\u00e1scara de CPU real que usar\u00e1n las tareas dentro del conjunto de CPU. Actualice tambi\u00e9n el segundo argumento de task_can_attach() a cs_effective_cpus para reflejar el cambio. Adem\u00e1s, se ha a\u00f1adido una comprobaci\u00f3n a task_can_attach() para evitar que cpumask_any_and() devuelva un valor mayor que nr_cpu_ids."}], "lastModified": "2025-11-19T13:29:49.433", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D7F94E3E-3387-47A2-BF64-B07D883DD8C4", "versionEndExcluding": "5.10.137", "versionStartIncluding": "3.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "51861563-7F40-460F-82CD-2D3FBDAD6618", "versionEndExcluding": "5.15.61", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5B42E453-8837-49D0-A5EF-03F818A6DC11", "versionEndExcluding": "5.18.18", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A1A2A5A5-4598-4D7E-BA07-4660398D6C8F", "versionEndExcluding": "5.19.2", "versionStartIncluding": "5.19"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}