CVE-2021-46977 (GCVE-0-2021-46977)
Vulnerability from cvelistv5 – Published: 2024-02-28 08:13 – Updated: 2025-05-04 07:01
VLAI?
Title
KVM: VMX: Disable preemption when probing user return MSRs
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Affected:
4be5341026246870818e28b53202b001426a5aec , < 31f29749ee970c251b3a7e5b914108425940d089
(git)
Affected: 4be5341026246870818e28b53202b001426a5aec , < 5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94 (git) Affected: 4be5341026246870818e28b53202b001426a5aec , < e3ea1895df719c4ef87862501bb10d95f4177bed (git) Affected: 4be5341026246870818e28b53202b001426a5aec , < 5104d7ffcf24749939bea7fdb5378d186473f890 (git) |
||
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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