CVE-2019-3887
Kernel: KVM: nVMX: guest accesses L0 MSR causes potential DoS
Severity
ImportantRed Hat Product Security
CVSS 3.0
Review impact separately from score.
Published · April 6, 2019
Updated · June 28, 2026
Description
A flaw was found in the way KVM hypervisor handled x2APIC Machine Specific Register (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.
Statement
This issue does not affect the version of the kernel package as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.0 · 6.7CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:H
CWE-863 · Incorrect Authorization