Auth bypass in Linux Kernel
CVE-2019-3887
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.
Vulnerability class: Broken Access Control
EPSS: 0.004 (28.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.6 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H.
Affected products
- Linux Linux_kernel
- The Linux Foundation Kernel — versions from 4.16
- Canonical Ubuntu_linux — versions 18.04, 18.10, 19.04
- Fedoraproject Fedora — versions 29
- Redhat Enterprise_linux — versions 8.0
- Redhat Enterprise_linux_eus — versions 8.1, 8.2, 8.4
- Redhat Enterprise_linux_for_real_time — versions 8
- Redhat Enterprise_linux_for_real_time_for_nfv — versions 8
- Redhat Enterprise_linux_for_real_time_for_nfv_tus — versions 8.2, 8.4
- Redhat Enterprise_linux_for_real_time_tus — versions 8.2, 8.4
Weakness classification (CWE)
References
- secalert@redhat.com (VDB Entry, Third Party Advisory, vdb-entry)
- secalert@redhat.com (vendor-advisory)
- secalert@redhat.com (vendor-advisory, Third Party Advisory)
- secalert@redhat.com (vendor-advisory, Third Party Advisory)
- secalert@redhat.com (vendor-advisory, Third Party Advisory)
- secalert@redhat.com (vendor-advisory, Third Party Advisory)
- secalert@redhat.com (vendor-advisory, Third Party Advisory)
- secalert@redhat.com (Patch, Third Party Advisory, Issue Tracking)
Frequently asked questions
- What is CVE-2019-3887?
- CVE-2019-3887 is a medium-severity vulnerability in Linux Kernel, classified under Incorrect Authorization. CVSS score: 5.6/10. Published 2019-04-09.
- How severe is CVE-2019-3887?
- Medium severity. CVSS v3 base score is 5.6 out of 10.