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CVE-2018-18397

5.5 · MEDIUM

The userfaultfd implementation in the Linux kernel before 4.19.7 mishandles access control for certain UFFDIO_ ioctl calls, as demonstrated by allowing local users to write data into holes in a tmp…

Published Dec 12, 2018CWE-863EPSS 0.51%

Overview

CVE-2018-18397 is a medium-severity vulnerability. It was published on December 12, 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

The userfaultfd implementation in the Linux kernel before 4.19.7 mishandles access control for certain UFFDIO_ ioctl calls, as demonstrated by allowing local users to write data into holes in a tmpfs file (if the user has read-only access to that file, and that file contains holes), related to fs/userfaultfd.c and mm/userfaultfd.c.

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=29ec90660d68bbdd69507c1c8b4e33aa299278b1Refaccess.redhat.com/errata/RHBA-2019:0327Refaccess.redhat.com/errata/RHSA-2019:0163Refaccess.redhat.com/errata/RHSA-2019:0202Refaccess.redhat.com/errata/RHSA-2019:0324Refaccess.redhat.com/errata/RHSA-2019:0831Refbugs.chromium.org/p/project-zero/issues/detail?id=1700Refcdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.87Refcdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.7GitHubgithub.com/torvalds/linux/commit/29ec90660d68bbdd69507c1c8b4e33aa299278b1

How CyberStrike helps

Frequently asked questions

What is CVE-2018-18397?

CVE-2018-18397 is a medium-severity vulnerability. It was published on December 12, 2018 and has a CVSS 3.0 base score of 5.5 (MEDIUM).

How severe is CVE-2018-18397?

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-2018-18397?

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-2018-18397?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-18397 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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