CVE-2021-46977: KVM: VMX: Disable preemption when probing user return MSRs
First published: Wed Feb 28 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=5.5<5.10.38 | |
| Linux Linux kernel | >=5.11<5.11.22 | |
| Linux Linux kernel | >=5.12<5.12.5 | |
| Linux Linux kernel | =5.13-rc1 |
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