Medium severity · published Apr 9, 2019
CVE-2019-3887
A flaw was found in the way KVM hypervisor handled x2APIC Machine Specific Rregister (MSR) access with nested(=1) virtualization enabled
5.6
CVSS
0.4%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
4.16 and later · source: NVD
EL
Enterprise Linux · Redhat
8.0 · source: NVD
EL
Enterprise Linux Eus · Redhat
8.1; 8.2; 8.4 · source: NVD
EL
Enterprise Linux For Real Time · Redhat
8 · source: NVD
EL
Enterprise Linux For Real Time For Nfv · Redhat
8 · source: NVD
EL
Enterprise Linux For Real Time For Nfv Tus · Redhat
8.2; 8.4 · source: NVD
EL
Enterprise Linux For Real Time Tus · Redhat
8.2; 8.4 · source: NVD
EL
Enterprise Linux Server Aus · Redhat
8.2; 8.4 · source: NVD
EL
Enterprise Linux Server Tus · Redhat
8.2; 8.4 · source: NVD
FE
Fedora · Fedoraproject
29 · source: NVD
UL
Ubuntu Linux · Canonical
18.04; 18.10; 19.04 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-3887
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-3887
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
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IWPOIII2L73HV5PGXSGMRMKQIK47UIYE/
Third Party Advisory
https://usn.ubuntu.com/3979-1/
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