Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.16 |
| Fedoraproject | Fedora | 29 |
| Canonical | Ubuntu Linux | 18.04 |
| Redhat | Enterprise Linux | 8.0 |
| Redhat | Enterprise Linux Eus | 8.1 |
| 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 |
| Redhat | Enterprise Linux For Real Time Tus | 8.2 |
| Redhat | Enterprise Linux Server Aus | 8.2 |
| Redhat | Enterprise Linux Server Tus | 8.2 |
Related Weaknesses (CWE)
References
- http://www.securityfocus.com/bid/107850Third Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2019:2703Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:2741Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3887Issue TrackingPatchThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- 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/107850Third Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2019:2703Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:2741Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3887Issue TrackingPatchThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://usn.ubuntu.com/3979-1/Third Party Advisory
- https://usn.ubuntu.com/3980-1/Third Party Advisory
FAQ
What is CVE-2019-3887?
CVE-2019-3887 is a vulnerability with a CVSS score of 5.6 (MEDIUM). 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 L...
How severe is CVE-2019-3887?
CVE-2019-3887 has been rated MEDIUM with a CVSS base score of 5.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-3887?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Fedoraproject Fedora, Canonical Ubuntu Linux, Redhat Enterprise Linux, Redhat Enterprise Linux Eus.