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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2021-46977

KVM: VMX: Disable preemption when probing user return MSRs

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 4be5341026246870818e28b53202b001426a5aec to < 31f29749ee970c251b3a7e5b914108425940d089affected
  • 4be5341026246870818e28b53202b001426a5aec to < 5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94affected
  • 4be5341026246870818e28b53202b001426a5aec to < e3ea1895df719c4ef87862501bb10d95f4177bedaffected
  • 4be5341026246870818e28b53202b001426a5aec to < 5104d7ffcf24749939bea7fdb5378d186473f890affected

Linux Linux

Default version status: affected

  • 5.5affected
  • 0 to < 5.5unaffected
  • 5.10.38 to ≤ 5.10.*unaffected
  • 5.11.22 to ≤ 5.11.*unaffected
  • 5.12.5 to ≤ 5.12.*unaffected
  • 5.13 to ≤ *unaffected

References