gsd-2021-47062
Vulnerability from gsd
Modified
2024-03-01 06:04
Details
In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Use online_vcpus, not created_vcpus, to iterate over vCPUs Use the kvm_for_each_vcpu() helper to iterate over vCPUs when encrypting VMSAs for SEV, which effectively switches to use online_vcpus instead of created_vcpus. This fixes a possible null-pointer dereference as created_vcpus does not guarantee a vCPU exists, since it is updated at the very beginning of KVM_CREATE_VCPU. created_vcpus exists to allow the bulk of vCPU creation to run in parallel, while still correctly restricting the max number of max vCPUs.
Aliases


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{
   gsd: {
      metadata: {
         exploitCode: "unknown",
         remediation: "unknown",
         reportConfidence: "confirmed",
         type: "vulnerability",
      },
      osvSchema: {
         aliases: [
            "CVE-2021-47062",
         ],
         details: "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.",
         id: "GSD-2021-47062",
         modified: "2024-03-01T06:04:48.320529Z",
         schema_version: "1.4.0",
      },
   },
   namespaces: {
      "cve.org": {
         CVE_data_meta: {
            ASSIGNER: "cve@kernel.org",
            ID: "CVE-2021-47062",
            STATE: "PUBLIC",
         },
         affects: {
            vendor: {
               vendor_data: [
                  {
                     product: {
                        product_data: [
                           {
                              product_name: "Linux",
                              version: {
                                 version_data: [
                                    {
                                       version_affected: "<",
                                       version_name: "ad73109ae7ec",
                                       version_value: "bd0cced2ae93",
                                    },
                                    {
                                       version_value: "not down converted",
                                       x_cve_json_5_version_data: {
                                          defaultStatus: "affected",
                                          versions: [
                                             {
                                                status: "affected",
                                                version: "5.11",
                                             },
                                             {
                                                lessThan: "5.11",
                                                status: "unaffected",
                                                version: "0",
                                                versionType: "custom",
                                             },
                                             {
                                                lessThanOrEqual: "5.11.*",
                                                status: "unaffected",
                                                version: "5.11.21",
                                                versionType: "custom",
                                             },
                                             {
                                                lessThanOrEqual: "5.12.*",
                                                status: "unaffected",
                                                version: "5.12.4",
                                                versionType: "custom",
                                             },
                                             {
                                                lessThanOrEqual: "*",
                                                status: "unaffected",
                                                version: "5.13",
                                                versionType: "original_commit_for_fix",
                                             },
                                          ],
                                       },
                                    },
                                 ],
                              },
                           },
                        ],
                     },
                     vendor_name: "Linux",
                  },
               ],
            },
         },
         data_format: "MITRE",
         data_type: "CVE",
         data_version: "4.0",
         description: {
            description_data: [
               {
                  lang: "eng",
                  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.",
               },
            ],
         },
         generator: {
            engine: "bippy-4986f5686161",
         },
         problemtype: {
            problemtype_data: [
               {
                  description: [
                     {
                        lang: "eng",
                        value: "n/a",
                     },
                  ],
               },
            ],
         },
         references: {
            reference_data: [
               {
                  name: "https://git.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2",
                  refsource: "MISC",
                  url: "https://git.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2",
               },
               {
                  name: "https://git.kernel.org/stable/c/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40",
                  refsource: "MISC",
                  url: "https://git.kernel.org/stable/c/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40",
               },
               {
                  name: "https://git.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1",
                  refsource: "MISC",
                  url: "https://git.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1",
               },
            ],
         },
      },
      "nvd.nist.gov": {
         cve: {
            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 resolvió 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 creación de vCPU se ejecute en paralelo, al mismo tiempo que restringe correctamente la cantidad máxima de vCPU máximas.",
               },
            ],
            id: "CVE-2021-47062",
            lastModified: "2024-03-01T14:04:26.010",
            metrics: {},
            published: "2024-02-29T23:15:07.843",
            references: [
               {
                  source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                  url: "https://git.kernel.org/stable/c/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40",
               },
               {
                  source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                  url: "https://git.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2",
               },
               {
                  source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                  url: "https://git.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1",
               },
            ],
            sourceIdentifier: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            vulnStatus: "Awaiting Analysis",
         },
      },
   },
}


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