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CVE-2017-7518

5.5 · MEDIUM

A flaw was found in the Linux kernel before version 4.12 in the way the KVM module processed the trap flag(TF) bit in EFLAGS during emulation of the syscall instruction, which leads to a debug exce…

Published Jul 30, 2018CWE-250EPSS 0.67%

Overview

CVE-2017-7518 is a medium-severity vulnerability. It was published on July 30, 2018 and has a CVSS 3.0 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

A flaw was found in the Linux kernel before version 4.12 in the way the KVM module processed the trap flag(TF) bit in EFLAGS during emulation of the syscall instruction, which leads to a debug exception(#DB) being raised in the guest stack. A user/process inside a guest could use this flaw to potentially escalate their privileges inside the guest. Linux guests are not affected by this.

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.openwall.com/lists/oss-security/2017/06/23/5Refwww.securityfocus.com/bid/99263Refwww.securitytracker.com/id/1038782Refaccess.redhat.com/articles/3290921Refaccess.redhat.com/errata/RHSA-2018:0395Refaccess.redhat.com/errata/RHSA-2018:0412Refbugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7518Refusn.ubuntu.com/3619-1/Refusn.ubuntu.com/3619-2/Refusn.ubuntu.com/3754-1/

How CyberStrike helps

Frequently asked questions

What is CVE-2017-7518?

CVE-2017-7518 is a medium-severity vulnerability. It was published on July 30, 2018 and has a CVSS 3.0 base score of 5.5 (MEDIUM).

How severe is CVE-2017-7518?

This vulnerability has a CVSS 3.0 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2017-7518?

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-2017-7518?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-7518 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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