{"api_version":"1","generated_at":"2026-04-22T21:16:17+00:00","cve":"CVE-2021-3656","urls":{"html":"https://cve.report/CVE-2021-3656","api":"https://cve.report/api/cve/CVE-2021-3656.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-3656","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-3656"},"summary":{"title":"CVE-2021-3656","description":"A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the \"virt_ext\" field, this issue could allow a malicious L1 to disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE) for the L2 guest. 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RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided.","Type":"Description","Title":null}]}}}