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CVE-2017-15126

8.1 · HIGH

A use-after-free flaw was found in fs/userfaultfd.c in the Linux kernel before 4.13.6.

Published Jan 14, 2018CWE-119EPSS 4.08%

Overview

CVE-2017-15126 is a high-severity vulnerability. It was published on January 14, 2018 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A use-after-free flaw was found in fs/userfaultfd.c in the Linux kernel before 4.13.6. The issue is related to the handling of fork failure when dealing with event messages. Failure to fork correctly can lead to a situation where a fork event will be removed from an already freed list of events with userfaultfd_ctx_put().

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=384632e67e0829deb8015ee6ad916b180049d252Refwww.securityfocus.com/bid/102516Refaccess.redhat.com/errata/RHSA-2018:0676Refaccess.redhat.com/errata/RHSA-2018:1062Refaccess.redhat.com/security/cve/CVE-2017-15126Refbugzilla.redhat.com/show_bug.cgi?id=1523481GitHubgithub.com/torvalds/linux/commit/384632e67e0829deb8015ee6ad916b180049d252Refwww.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.6Refgit.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=384632e67e0829deb8015ee6ad916b180049d252Refwww.securityfocus.com/bid/102516

How CyberStrike helps

Frequently asked questions

What is CVE-2017-15126?

CVE-2017-15126 is a high-severity vulnerability. It was published on January 14, 2018 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2017-15126?

This vulnerability has a CVSS 3.1 base score of 8.1, 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-2017-15126?

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-2017-15126?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-15126 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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