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CVE PROGRAM SOURCE RECORDUnscored

CVE-2021-47062

KVM: SVM: Use online_vcpus, not created_vcpus, to iterate over vCPUs

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • ad73109ae7ec30d5bfb76be108e304f9f0af4829 to < bd0cced2ae93195668f983d443f7f17e8efd24d2affected
  • ad73109ae7ec30d5bfb76be108e304f9f0af4829 to < ba7bf5d6336aa9c0d977b161bfa420c56d46ee40affected
  • ad73109ae7ec30d5bfb76be108e304f9f0af4829 to < c36b16d29f3af5f32fc1b2a3401bf48f71cabee1affected

Linux Linux

Default version status: affected

  • 5.11affected
  • 0 to < 5.11unaffected
  • 5.11.21 to ≤ 5.11.*unaffected
  • 5.12.4 to ≤ 5.12.*unaffected
  • 5.13 to ≤ *unaffected

References