Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2021-47062

Severity CVSS v4.0:
Pending analysis
Type:
CWE-476 NULL Pointer Dereference
Publication date:
29/02/2024
Last modified:
10/12/2024

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> KVM: SVM: Use online_vcpus, not created_vcpus, to iterate over vCPUs<br /> <br /> Use the kvm_for_each_vcpu() helper to iterate over vCPUs when encrypting<br /> VMSAs for SEV, which effectively switches to use online_vcpus instead of<br /> created_vcpus. This fixes a possible null-pointer dereference as<br /> created_vcpus does not guarantee a vCPU exists, since it is updated at<br /> the very beginning of KVM_CREATE_VCPU. created_vcpus exists to allow the<br /> bulk of vCPU creation to run in parallel, while still correctly<br /> restricting the max number of max vCPUs.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
5.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.11 (including) 5.11.21 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.12 (including) 5.12.4 (excluding)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools