CVE-2019-3887
Medium
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.
SeverityMedium
CVSS5.6
Exploit probability—
Product
Linux Kernel
PublishedApr 9, 2019
First seenApr 9, 2019
Weakness typeCWE-863Incorrect authorization
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 4.16 ≤ v | — |
| fedoraproject fedora | 29 | — |
| canonical ubuntu_linux | 18.04, 18.10, 19.04 | — |
| redhat enterprise_linux | 8.0 | — |
| redhat enterprise_linux_eus | 8.1, 8.2, 8.4 | — |
| redhat enterprise_linux_for_real_time | 8 | — |
| redhat enterprise_linux_for_real_time_for_nfv | 8 | — |
| redhat enterprise_linux_for_real_time_for_nfv_tus | 8.2, 8.4 | — |
| redhat enterprise_linux_for_real_time_tus | 8.2, 8.4 | — |
| redhat enterprise_linux_server_aus | 8.2, 8.4 | — |
| redhat enterprise_linux_server_tus | 8.2, 8.4 | — |
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