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CVE

CVE-2019-3887

A flaw was found in the way KVM hypervisor handled x2APIC Machine Specific Rregister (MSR) access with nested(=1) virtua

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.

MEDIUM · CVSS 5.6 EPSS 0.00035
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-863Incorrect Authorization
CWE-863Incorrect Authorization
▤

Affected Products & Versions

11
linux kernel>= 4.16
fedoraproject fedoraall versions
canonical ubuntu linuxall versions
redhat enterprise linuxall versions
redhat enterprise linux eusall versions
redhat enterprise linux for real timeall versions
redhat enterprise linux for real time for nfvall versions
redhat enterprise linux for real time for nfv tusall versions
▣

Scoring & Timeline

5.6
MEDIUM · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD09 Apr 2019 · 04:29 PM
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
⚑

Vendor Advisories

8
suse-csafopenSUSE-SU-2024:10728-1
suse-csafopenSUSE-SU-2024:13704-1
msrcCVE-2019-3887
rhsaRHSA-2019:2703Important
rhsaRHSA-2019:2741Important
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.securityfocus.com/bid/107850Third Party AdvisoryVDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3887Issue TrackingPatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IWPOIII2L73HV5PGXSGMRMKQIK47UIYE/
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
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