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Vulnerability CVE-2021-47062
Published: 2024-02-29 Modified: 2024-03-01
| Description: |
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. |
References: |
https://git.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2
https://git.kernel.org/stable/c/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40
https://git.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1
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