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CVE-2018-5391

7.5 · HIGH

The Linux kernel, versions 3.9+, is vulnerable to a denial of service attack with low rates of specially modified packets targeting IP fragment re-assembly.

Published Sep 6, 2018CWE-400EPSS 32.45%

Overview

CVE-2018-5391 is a high-severity vulnerability. It was published on September 6, 2018 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The Linux kernel, versions 3.9+, is vulnerable to a denial of service attack with low rates of specially modified packets targeting IP fragment re-assembly. An attacker may cause a denial of service condition by sending specially crafted IP fragments. Various vulnerabilities in IP fragmentation have been discovered and fixed over the years. The current vulnerability (CVE-2018-5391) became exploitable in the Linux kernel with the increase of the IP fragment reassembly queue size.

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.arubanetworks.com/assets/alert/ARUBA-PSA-2018-004.txtRefwww.huawei.com/en/psirt/security-advisories/huawei-sa-20200115-01-linux-enRefwww.openwall.com/lists/oss-security/2019/06/28/2Refwww.openwall.com/lists/oss-security/2019/07/06/3Refwww.openwall.com/lists/oss-security/2019/07/06/4Refwww.securityfocus.com/bid/105108Refwww.securitytracker.com/id/1041476Refwww.securitytracker.com/id/1041637Refaccess.redhat.com/errata/RHSA-2018:2785Refaccess.redhat.com/errata/RHSA-2018:2791

How CyberStrike helps

Frequently asked questions

What is CVE-2018-5391?

CVE-2018-5391 is a high-severity vulnerability. It was published on September 6, 2018 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2018-5391?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2018-5391?

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-2018-5391?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-5391 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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