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{"bugzilla": {"description": "kernel: KVM: SVM: null pointer in online_vcpus, not created_vcpus, to iterate over vCPUs", "id": "2267171", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2267171"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nKVM: SVM: Use online_vcpus, not created_vcpus, to iterate over vCPUs\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.", "A flaw was found in the Linux kernel's Kernel-based virtual machine (KVM) subsystem for AMD's Secure virtual machine (SVM). The issue occurs when using the created_vcpus list to iterate over vCPUs instead of the online_vcpus list, leading to a possible NULL pointer dereference. This vulnerability impacts the encryption of Virtual Machine Save Areas (VMSAs) for Secure Encrypted Virtualization (SEV)."], "name": "CVE-2021-47062", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-02-29T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47062\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47062\nhttps://lore.kernel.org/linux-cve-announce/2024022953-CVE-2021-47062-ed39@gregkh/T/#u"], "threat_severity": "Moderate"}