medium
6.7
CWE
863
Advisory 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. Kernel versions from 4.16 and newer are vulnerable to this issue.

Credit: 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
ubuntu/linux<4.18.0-20.21
4.18.0-20.21
ubuntu/linux<5.0.0-15.16
5.0.0-15.16
ubuntu/linux<5.1~
5.1~
ubuntu/linux-aws<4.18.0-1016.18
4.18.0-1016.18
ubuntu/linux-aws<5.0.0-1006.6
5.0.0-1006.6
ubuntu/linux-aws<5.1~
5.1~
ubuntu/linux-aws-hwe<5.1~
5.1~
ubuntu/linux-azure<4.18.0-1018.18~18.04.1
4.18.0-1018.18~18.04.1
ubuntu/linux-azure<4.18.0-1018.18
4.18.0-1018.18
ubuntu/linux-azure<5.0.0-1006.6
5.0.0-1006.6
ubuntu/linux-azure<5.1~
5.1~
ubuntu/linux-azure-edge<4.18.0-1018.18~18.04.1
4.18.0-1018.18~18.04.1
ubuntu/linux-azure-edge<5.1~
5.1~
ubuntu/linux-euclid<5.1~
5.1~
ubuntu/linux-flo<5.1~
5.1~
ubuntu/linux-gcp<4.18.0-1011.12
4.18.0-1011.12
ubuntu/linux-gcp<5.0.0-1006.6
5.0.0-1006.6
ubuntu/linux-gcp<5.1~
5.1~
ubuntu/linux-gcp-edge<4.18.0-1011.12~18.04.1
4.18.0-1011.12~18.04.1
ubuntu/linux-gcp-edge<5.1~
5.1~
ubuntu/linux-gke<5.1~
5.1~
ubuntu/linux-goldfish<5.1~
5.1~
ubuntu/linux-grouper<5.1~
5.1~
ubuntu/linux-hwe<4.18.0-20.21~18.04.1
4.18.0-20.21~18.04.1
ubuntu/linux-hwe<5.1~
5.1~
ubuntu/linux-hwe-edge<5.1~
5.1~
ubuntu/linux-kvm<4.18.0-1012.12
4.18.0-1012.12
ubuntu/linux-kvm<5.0.0-1006.6
5.0.0-1006.6
ubuntu/linux-kvm<5.1~
5.1~
ubuntu/linux-lts-trusty<5.1~
5.1~
ubuntu/linux-lts-utopic<5.1~
5.1~
ubuntu/linux-lts-vivid<5.1~
5.1~
ubuntu/linux-lts-wily<5.1~
5.1~
ubuntu/linux-lts-xenial<5.1~
5.1~
ubuntu/linux-maguro<5.1~
5.1~
ubuntu/linux-mako<5.1~
5.1~
ubuntu/linux-manta<5.1~
5.1~
ubuntu/linux-oem<5.1~
5.1~
ubuntu/linux-oracle<5.1~
5.1~
ubuntu/linux-raspi2<4.18.0-1014.16
4.18.0-1014.16
ubuntu/linux-raspi2<5.0.0-1008.8
5.0.0-1008.8
ubuntu/linux-raspi2<5.1~
5.1~
ubuntu/linux-snapdragon<5.0.0-1012.12
5.0.0-1012.12
ubuntu/linux-snapdragon<5.1~
5.1~
debian/linux
4.19.249-2
4.19.304-1
5.10.209-2
5.10.205-2
6.1.76-1
6.1.85-1
6.6.15-2
6.7.12-1

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

Remedy

https://git.kernel.org/linus/15303ba5d1cd9b28d03a980456c0978c0ea3b208

Remedy

https://git.kernel.org/linus/acff78477b9b4f26ecdf65733a4ed77fe837e9dc

Remedy

https://git.kernel.org/linus/c992384bde84fb2f0318bdb4f6c710605dd7a217

Remedy

https://git.kernel.org/linus/c73f4c998e1fd4249b9edfa39e23f4fda2b9b041

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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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