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Red Hat: CVE-2019-3887: CVE-2019-3887 Kernel: KVM: nVMX: guest accesses L0 MSR causes potential DoS (Multiple Advisories)

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Red Hat: CVE-2019-3887: CVE-2019-3887 Kernel: KVM: nVMX: guest accesses L0 MSR causes potential DoS (Multiple Advisories)

Severity
5
CVSS
(AV:L/AC:M/Au:N/C:N/I:N/A:C)
Published
04/09/2019
Created
09/12/2019
Added
09/11/2019
Modified
03/13/2024

Description

A flaw was found in the way KVM hypervisor handled x2APIC Machine Specific Rregister (MSR) access with nested(=1) virtualization enabled. In that, L1 guest could access L0's APIC register values via L2 guest, when 'virtualize x2APIC mode' is enabled. A guest could use this flaw to potentially crash the host kernel resulting in DoS issue. Kernel versions from 4.16 and newer are vulnerable to this issue.

Solution(s)

  • redhat-upgrade-kernel
  • redhat-upgrade-kernel-rt

References

  • 107850
  • CVE-2019-3887
  • RHSA-2019:2703
  • RHSA-2019:2741

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