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CVE-2018-16882

8.8 · HIGH

A use-after-free issue was found in the way the Linux kernel's KVM hypervisor processed posted interrupts when nested(=1) virtualization is enabled.

Published Jan 3, 2019CWE-416EPSS 0.36%

Overview

CVE-2018-16882 is a high-severity vulnerability. It was published on January 3, 2019 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

A use-after-free issue was found in the way the Linux kernel's KVM hypervisor processed posted interrupts when nested(=1) virtualization is enabled. In nested_get_vmcs12_pages(), in case of an error while processing posted interrupt address, it unmaps the 'pi_desc_page' without resetting 'pi_desc' descriptor address, which is later used in pi_test_and_clear_on(). A guest user/process could use this flaw to crash the host kernel resulting in DoS or potentially gain privileged access to a system. Kernel versions before 4.14.91 and before 4.19.13 are vulnerable.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.securityfocus.com/bid/106254Refbugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16882Reflwn.net/Articles/775720/Reflwn.net/Articles/775721/Refmarc.info/?l=kvm&m=154514994222809&w=2Refsupport.f5.com/csp/article/K80557033Refusn.ubuntu.com/3871-1/Refusn.ubuntu.com/3871-3/Refusn.ubuntu.com/3871-4/Refusn.ubuntu.com/3871-5/

How CyberStrike helps

Frequently asked questions

What is CVE-2018-16882?

CVE-2018-16882 is a high-severity vulnerability. It was published on January 3, 2019 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2018-16882?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2018-16882?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2018-16882?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-16882 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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