CVE-2021-47062 (GCVE-0-2021-47062)

Vulnerability from cvelistv5 – Published: 2024-02-29 22:37 – Updated: 2026-05-11 13:47
VLAI
Title
KVM: SVM: Use online_vcpus, not created_vcpus, to iterate over vCPUs
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ad73109ae7ec30d5bfb76be108e304f9f0af4829 , < bd0cced2ae93195668f983d443f7f17e8efd24d2 (git)
Affected: ad73109ae7ec30d5bfb76be108e304f9f0af4829 , < ba7bf5d6336aa9c0d977b161bfa420c56d46ee40 (git)
Affected: ad73109ae7ec30d5bfb76be108e304f9f0af4829 , < c36b16d29f3af5f32fc1b2a3401bf48f71cabee1 (git)
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Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.11.21 , ≤ 5.11.* (semver)
Unaffected: 5.12.4 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.