CVE-2019-3887

moderate-risk
Published 2019-04-09

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.

Do I need to act?

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0.04% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.6/10 Medium
LOCAL / HIGH complexity

Affected Products (19)

Affected Vendors

Redhat Linux Canonical Fedoraproject

References (16)

Third Party Advisory http://www.securityfocus.com/bid/107850
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:2703
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:2741
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3887
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
Third Party Advisory https://usn.ubuntu.com/3979-1/
Third Party Advisory https://usn.ubuntu.com/3980-1/
Third Party Advisory https://usn.ubuntu.com/3980-2/
Third Party Advisory http://www.securityfocus.com/bid/107850
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:2703
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:2741
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3887
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
Third Party Advisory https://usn.ubuntu.com/3979-1/
Third Party Advisory https://usn.ubuntu.com/3980-1/
Third Party Advisory https://usn.ubuntu.com/3980-2/
34
/ 100
moderate-risk
Severity 15/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 19/34 · Moderate