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CVE-2016-9777

7.8 · HIGH

KVM in the Linux kernel before 4.8.12, when I/O APIC is enabled, does not properly restrict the VCPU index, which allows guest OS users to gain host OS privileges or cause a denial of service (out-…

Published Dec 28, 2016CWE-125EPSS 0.38%

Overview

CVE-2016-9777 is a high-severity vulnerability. It was published on December 28, 2016 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

KVM in the Linux kernel before 4.8.12, when I/O APIC is enabled, does not properly restrict the VCPU index, which allows guest OS users to gain host OS privileges or cause a denial of service (out-of-bounds array access and host OS crash) via a crafted interrupt request, related to arch/x86/kvm/ioapic.c and arch/x86/kvm/ioapic.h.

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

Refgit.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=81cdb259fb6d8c1c4ecfeea389ff5a73c07f5755Refwww.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.12Refwww.openwall.com/lists/oss-security/2016/12/02/2Refwww.securityfocus.com/bid/94640Refbugzilla.redhat.com/show_bug.cgi?id=1400804GitHubgithub.com/torvalds/linux/commit/81cdb259fb6d8c1c4ecfeea389ff5a73c07f5755Refgit.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=81cdb259fb6d8c1c4ecfeea389ff5a73c07f5755Refwww.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.12Refwww.openwall.com/lists/oss-security/2016/12/02/2Refwww.securityfocus.com/bid/94640

How CyberStrike helps

Frequently asked questions

What is CVE-2016-9777?

CVE-2016-9777 is a high-severity vulnerability. It was published on December 28, 2016 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2016-9777?

This vulnerability has a CVSS 3.1 base score of 7.8, 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-2016-9777?

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-2016-9777?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2016-9777 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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