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CVE-2021-46977

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CVE-2021-46977

Published: Feb 28, 2024

Modified: May 11, 2026

PUBLISHED

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.

VendorProductVersions

Linux

Linux

affected
4be5341026246870818e28b53202b001426a5aec - < 31f29749ee970c251b3a7e5b914108425940d089
affected
4be5341026246870818e28b53202b001426a5aec - < 5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94
affected
4be5341026246870818e28b53202b001426a5aec - < e3ea1895df719c4ef87862501bb10d95f4177bed
affected
4be5341026246870818e28b53202b001426a5aec - < 5104d7ffcf24749939bea7fdb5378d186473f890

Linux

Linux

affected
5.5
unaffected
0 - < 5.5
unaffected
5.10.38 - <= 5.10.*
unaffected
5.11.22 - <= 5.11.*
unaffected
5.12.5 - <= 5.12.*

+1 more versions

References

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