CVE-2017-15126

Name: CVE-2017-15126
Creator: NVD / NIST
Published: 2018-01-14T06:29:00.217+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 4.08%

Last modified Jun 17, 2026

CVE-2017-15126 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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. EPSS estimates a 4.08% chance of exploitation in the next 30 days.

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().

Metrics

CVSS 3.1

8.1/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

4.08%

89.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	>= 4.11, < 4.13.6

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=384632e67e0829deb8015ee6ad916b180049d252Vendor Advisory
http://www.securityfocus.com/bid/102516Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:0676Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1062Third Party Advisory
https://access.redhat.com/security/cve/CVE-2017-15126Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1523481Issue Tracking, Third Party Advisory
https://github.com/torvalds/linux/commit/384632e67e0829deb8015ee6ad916b180049d252Third Party Advisory
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.6Vendor Advisory
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=384632e67e0829deb8015ee6ad916b180049d252Vendor Advisory
http://www.securityfocus.com/bid/102516Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:0676Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1062Third Party Advisory
https://access.redhat.com/security/cve/CVE-2017-15126Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1523481Issue Tracking, Third Party Advisory
https://github.com/torvalds/linux/commit/384632e67e0829deb8015ee6ad916b180049d252Third Party Advisory
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.6Vendor Advisory

Timeline

Published: Jan 14, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-15126?

How severe is CVE-2017-15126?

CVE-2017-15126 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 4.08% probability of exploitation in the next 30 days.

How do I fix CVE-2017-15126?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-15126?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST