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CVE-2021-47062

UNKNOWN
Published 2024-02-29T22:37:36.468Z
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No CVSS data available

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

Linux

Linux

Affected Versions:

ad73109ae7ec30d5bfb76be108e304f9f0af4829 ad73109ae7ec30d5bfb76be108e304f9f0af4829 ad73109ae7ec30d5bfb76be108e304f9f0af4829
Linux

Linux

Affected Versions:

5.11 0 5.11.21 5.12.4 5.13

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed MODERATE

GHSA-2948-3mj2-4gw2

Advisory Details

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.

CVSS Scoring

CVSS Score

5.0

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2021-47062
WEB https://git.kernel.org/stable/c/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40
WEB https://git.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2
WEB https://git.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1

Advisory provided by GitHub Security Advisory Database. Published: March 1, 2024, Modified: December 10, 2024

References

https://git.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2
https://git.kernel.org/stable/c/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40
https://git.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1
Published: 2024-02-29T22:37:36.468Z
Last Modified: 2025-05-04T07:03:25.492Z
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