CVE-2021-46977
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2021
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
KVM: VMX: Disable preemption when probing user return MSRs
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 4be5341026246870818e28b53202b001426a5aec | affected | git | 31f29749ee970c251b3a7e5b914108425940d089 | Unavailable | None listed |
| 4be5341026246870818e28b53202b001426a5aec | affected | git | 5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94 | Unavailable | None listed |
| 4be5341026246870818e28b53202b001426a5aec | affected | git | e3ea1895df719c4ef87862501bb10d95f4177bed | Unavailable | None listed |
| 4be5341026246870818e28b53202b001426a5aec | affected | git | 5104d7ffcf24749939bea7fdb5378d186473f890 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 5.5 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 5.5 | Unavailable | None listed |
| 5.10.38 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.11.22 | unaffected | semver | Unavailable | 5.11.* | None listed |
| 5.12.5 | unaffected | semver | Unavailable | 5.12.* | None listed |
| 5.13 | unaffected | original_commit_for_fix | Unavailable | * | None listed |