Vulnerability CVE-2019-3887
Published: 2019-04-09

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.

Type:

CWE-20

 (Improper Input Validation)

CVSS2 => (AV:L/AC:M/Au:N/C:N/I:N/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.7/10
6.9/10
3.4/10
Exploit range
Attack complexity
Authentication
Local
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Complete
Affected software
Linux -> Linux kernel 

 References:
http://www.securityfocus.com/bid/107850
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3887
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IWPOIII2L73HV5PGXSGMRMKQIK47UIYE/
https://usn.ubuntu.com/3979-1/
https://usn.ubuntu.com/3980-1/
https://usn.ubuntu.com/3980-2/
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