CVE-2019-3887 Denial of service in Kernel

What is CVE-2019-3887?

CVE-2019-3887 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 9 Apr 2019. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-863

Which versions are affected by CVE-2019-3887?

It affects 11 products.

Products include Canonical Ubuntu Linux, Fedoraproject Fedora, Linux kernel, Redhat Enterprise Linux, Redhat Enterprise Linux Eus, Redhat Enterprise Linux for Real Time and 5 more.

How do I fix CVE-2019-3887?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2019-3887 being exploited?

There is no known exploitation of CVE-2019-3887 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-34854, AZL-6521, DEBIAN-CVE-2019-3887, GHSA-j2cm-6mgm-v7v4, UBUNTU-CVE-2019-3887.