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Vulnerabilities CVE-2021-46977

CVE-2021-46977

High
Open
TLP:CLEAR

KVM: VMX: Disable preemption when probing user return MSRs

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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'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.

Details

CVSS Score
7.8
EPSS Score
0.24%

15.5th percentile

CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Confidence
90%
Published
Feb 28, 2024
Last Modified
Aug 5, 2026
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