CVE-2021-46977
KVM: VMX: Disable preemption when probing user return MSRs
Reported by linux · Published February 28, 2024
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.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| Linux | Linux | 5104d7ffcf24749939bea7fdb5378d186473f890 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | 4be5341026246870818e28b53202b001426a5aec, 4be5341026246870818e28b53202b001426a5aec, 4be5341026246870818e28b53202b001426a5aec |
| Linux | Linux | 5.5, 0, 5.10.38 |
| Linux | Linux | 4be5341026246870818e28b53202b001426a5aec, 5.11.22, 5.13 |
| linux | linux_kernel | 5.5, 5.5, 5.5 |
Timeline
- Feb 28, 2024 CVE Published
- Feb 29, 2024 EPSS Score (30 in total, the first dated here)
- Apr 2, 2026 Security Advisory
- Jul 13, 2026 Coalition ESS Score
- Aug 4, 2026 CVE Updated
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