{"id":"CVE-2021-47062","state":"PUBLISHED","title":"KVM: SVM: Use online_vcpus, not created_vcpus, to iterate over vCPUs","description":"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.","publishedAt":"2024-02-29T22:37:36.468Z","updatedAt":"2026-05-11T13:47:20.656Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ad73109ae7ec30d5bfb76be108e304f9f0af4829","status":"affected","lessThan":"bd0cced2ae93195668f983d443f7f17e8efd24d2","versionType":"git"},{"version":"ad73109ae7ec30d5bfb76be108e304f9f0af4829","status":"affected","lessThan":"ba7bf5d6336aa9c0d977b161bfa420c56d46ee40","versionType":"git"},{"version":"ad73109ae7ec30d5bfb76be108e304f9f0af4829","status":"affected","lessThan":"c36b16d29f3af5f32fc1b2a3401bf48f71cabee1","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kvm/svm/sev.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"5.11.21","status":"unaffected","lessThanOrEqual":"5.11.*","versionType":"semver"},{"version":"5.12.4","status":"unaffected","lessThanOrEqual":"5.12.*","versionType":"semver"},{"version":"5.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kvm/svm/sev.c"]}],"references":["https://git.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2","https://git.kernel.org/stable/c/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40","https://git.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47062.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47062","state":"PUBLISHED","datePublished":"2024-02-29T22:37:36.468Z","dateUpdated":"2026-05-11T13:47:20.656Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-02-29T22:33:44.294Z"},"containers":{"cna":{"title":"KVM: SVM: Use online_vcpus, not created_vcpus, to iterate over vCPUs","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ad73109ae7ec30d5bfb76be108e304f9f0af4829","status":"affected","lessThan":"bd0cced2ae93195668f983d443f7f17e8efd24d2","versionType":"git"},{"version":"ad73109ae7ec30d5bfb76be108e304f9f0af4829","status":"affected","lessThan":"ba7bf5d6336aa9c0d977b161bfa420c56d46ee40","versionType":"git"},{"version":"ad73109ae7ec30d5bfb76be108e304f9f0af4829","status":"affected","lessThan":"c36b16d29f3af5f32fc1b2a3401bf48f71cabee1","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kvm/svm/sev.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"5.11.21","status":"unaffected","lessThanOrEqual":"5.11.*","versionType":"semver"},{"version":"5.12.4","status":"unaffected","lessThanOrEqual":"5.12.*","versionType":"semver"},{"version":"5.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kvm/svm/sev.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2"},{"url":"https://git.kernel.org/stable/c/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40"},{"url":"https://git.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T13:47:20.656Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.11.21"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.12.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.13"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2021-47062","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-03-05T22:14:24.335971Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-06-04T17:14:09.060Z"}},{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-04T05:24:39.873Z"}}]}}}