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CVE-2017-15126

27
FAUCET Score

CVE-2017-15126 is a high-severity use-after-free vulnerability in the Linux kernel (before version 4.13.6), specifically within the fs/userfaultfd.c component. This flaw arises from improper handling of fork failures when processing event messages, potentially leading to a fork event being removed from an already freed list. With a CVSS score of 8.1, this vulnerability is network-exploitable with high impact on confidentiality, integrity, and availability, though it has high attack complexity. There is no known active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 4.11, < 4.13.6CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
4.08%
Probability of exploitation in next 30 days
EPSS Percentile
89.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0408 is in the 53rd percentile among its peer group of 8,920 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-rt-0:3.10.0-862.rt56.804.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-0:3.10.0-862.el7
View patch
redhatno patchvia redhat_api
Product: Red Hat Enterprise MRG 2Fixed in: realtime-kernel

Vendor Advisories (1)

redhatCVE-2017-15126Moderate

kernel: Use-after-free in userfaultfd_event_wait_completion function in userfaultfd.c

Dec 5, 2017

References

git.kernel.org / cgit/linux/kernel/git/torvalds/linux.git/commit
Vendor Advisory
access.redhat.com / errata/RHSA-2018:0676
Third Party Advisory
access.redhat.com / errata/RHSA-2018:1062
Third Party Advisory
access.redhat.com / security/cve/CVE-2017-15126
Third Party Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party Advisory
github.com / torvalds/linux/commit/384632e67e0829deb8015ee6ad916b180049d252
Third Party Advisory
kernel.org / pub/linux/kernel/v4.x/ChangeLog-4.13.6
Vendor Advisory
securityfocus.com / bid/102516
Third Party AdvisoryVDB Entry