CVE-2021-47062

{"id": "CVE-2021-47062", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2024-02-29T23:15:07.843", "references": [{"url": "https://git.kernel.org/stable/c/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-476"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: Use online_vcpus, not created_vcpus, to iterate over vCPUs\n\nUse the kvm_for_each_vcpu() helper to iterate over vCPUs when encrypting\nVMSAs for SEV, which effectively switches to use online_vcpus instead of\ncreated_vcpus. This fixes a possible null-pointer dereference as\ncreated_vcpus does not guarantee a vCPU exists, since it is updated at\nthe very beginning of KVM_CREATE_VCPU. created_vcpus exists to allow the\nbulk of vCPU creation to run in parallel, while still correctly\nrestricting the max number of max vCPUs."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: KVM: SVM: use online_vcpus, no creado_vcpus, para iterar sobre vCPU. Use el asistente kvm_for_each_vcpu() para iterar sobre vCPU al cifrar VMSA para SEV, que efectivamente cambia para usar online_vcpus en lugar de creado_vcpus. Esto corrige una posible desreferencia de puntero nulo ya que create_vcpus no garantiza que exista una vCPU, ya que se actualiza al comienzo de KVM_CREATE_VCPU. create_vcpus existe para permitir que la mayor parte de la creaci\u00f3n de vCPU se ejecute en paralelo, al mismo tiempo que restringe correctamente la cantidad m\u00e1xima de vCPU m\u00e1ximas."}], "lastModified": "2024-12-10T16:43:41.337", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8CBB94EC-EC33-4464-99C5-03E5542715F0", "versionEndExcluding": "5.11.21", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D8C7052F-1B7B-4327-9C2B-84EBF3243838", "versionEndExcluding": "5.12.4", "versionStartIncluding": "5.12"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}