CVE-2021-46977

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

28/02/2024

Last modified:

08/01/2025

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: VMX: Disable preemption when probing user return MSRs Disable preemption when probing a user return MSR via RDSMR/WRMSR. If the MSR holds a different value per logical CPU, the WRMSR could corrupt the host&#39;s value if KVM is preempted between the RDMSR and WRMSR, and then rescheduled on a different CPU. Opportunistically land the helper in common x86, SVM will use the helper in a future commit.

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::::::::	5.5 (including)	5.10.38 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.11 (including)	5.11.22 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.12 (including)	5.12.5 (excluding)
cpe:2.3:o:linux:linux_kernel:5.13:rc1::::::

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

CVE-2021-46977

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools