medium
6.7
CWE
863
Advisory Published
CVE Published
CVE Published
Updated

CVE-2019-3887

First published: Tue Apr 02 2019(Updated: )

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. Upstream patches: ----------------- -&gt; <a href="https://git.kernel.org/pub/scm/virt/kvm/kvm.git/commit/?id=acff78477b9b4f26ecdf65733a4ed77fe837e9dc">https://git.kernel.org/pub/scm/virt/kvm/kvm.git/commit/?id=acff78477b9b4f26ecdf65733a4ed77fe837e9dc</a> -&gt; <a href="https://git.kernel.org/pub/scm/virt/kvm/kvm.git/commit/?id=c73f4c998e1fd4249b9edfa39e23f4fda2b9b041">https://git.kernel.org/pub/scm/virt/kvm/kvm.git/commit/?id=c73f4c998e1fd4249b9edfa39e23f4fda2b9b041</a> Reference: ---------- -&gt; <a href="https://www.openwall.com/lists/oss-security/2019/04/08/1">https://www.openwall.com/lists/oss-security/2019/04/08/1</a>

Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/kernel-rt<0:4.18.0-80.11.1.rt9.156.el8_0
0:4.18.0-80.11.1.rt9.156.el8_0
redhat/kernel<0:4.18.0-80.11.1.el8_0
0:4.18.0-80.11.1.el8_0
Linux Linux kernel>=4.16
Fedoraproject Fedora=29
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=18.10
Canonical Ubuntu Linux=19.04
Redhat Enterprise Linux=8.0
Redhat Enterprise Linux Eus=8.1
Redhat Enterprise Linux Eus=8.2
Redhat Enterprise Linux Eus=8.4
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 For Nfv Tus=8.4
Redhat Enterprise Linux For Real Time Tus=8.2
Redhat Enterprise Linux For Real Time Tus=8.4
Redhat Enterprise Linux Server Aus=8.2
Redhat Enterprise Linux Server Aus=8.4
Redhat Enterprise Linux Server Tus=8.2
Redhat Enterprise Linux Server Tus=8.4
debian/linux
5.10.223-1
5.10.226-1
6.1.115-1
6.1.119-1
6.12.5-1
6.12.6-1

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3887

Remedy

If qemu is installed, to prevent nested virtualization from being enabled, set "options kvm_intel nested=0" in /etc/modprobe.d/qemu-system-x86.conf

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2019-3887?

    CVE-2019-3887 is a vulnerability in the KVM hypervisor that allows an L1 guest to access the APIC register values of an L0 guest via an L2 guest, when 'virtualize x2APIC mode' is enabled.

  • What is the severity of CVE-2019-3887?

    CVE-2019-3887 has a severity score of 6.7, which is classified as high.

  • What software is affected by CVE-2019-3887?

    The affected software includes linux-aws, linux-azure, linux-gcp, linux-hwe, linux-kvm, and more.

  • How can I fix CVE-2019-3887?

    To fix CVE-2019-3887, it is recommended to update the affected software to the specified versions that include the necessary patches.

  • Where can I find more information about CVE-2019-3887?

    You can find more information about CVE-2019-3887 in the provided references.

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