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CVE-2017-15126

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

8.1 HighFix available

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().

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

4.08%Up 2.2 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 8.1

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().

Record
CVE-2017-15126
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
9.3 HighAV:N/AC:M/Au:N/C:C/I:C/A:C
Weakness
CWE-119, CWE-416
Updated
2026-11-02
CVE List No score

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().

Record
CVE-2017-15126
Weakness
CWE-119
Updated
2026-11-02
EUVDEUVD-2017-6587 No score

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().

Record
EUVD-2017-6587
Updated
2026-11-03
GitHub AdvisoriesGHSA-v4mc-2f9f-5jw2 8.1

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

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().

Record
GHSA-v4mc-2f9f-5jw2
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-119, CWE-416
Updated
2026-11-02
OSV 8.1

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().

Record
CVE-2017-15126
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2017-15126 8.1

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().

Record
DEBIAN-CVE-2017-15126
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRHSA-2018:0676 7.8

Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update

Record
RHSA-2018:0676
CVSS 3.0
7.8 HighCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRHSA-2018:1062 7.8

Red Hat Security Advisory: kernel security, bug fix, and enhancement update

Record
RHSA-2018:1062
CVSS 3.0
7.8 HighCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2017-15126 8.1

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().

Record
UBUNTU-CVE-2017-15126
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
linux
Debian:12
before 4.13.10-1
4.13.10-1
linux
Debian:13
before 4.13.10-1
4.13.10-1
linux
Debian:14
before 4.13.10-1
4.13.10-1
kernel-rt
Red Hat:rhel_extras_rt:7
From an advisory covering 29 CVEs
before 0:3.10.0-862.rt56.804.el7
0:3.10.0-862.rt56.804.el7
kernel-rt-debug
Red Hat:rhel_extras_rt:7
From an advisory covering 29 CVEs
before 0:3.10.0-862.rt56.804.el7
0:3.10.0-862.rt56.804.el7
kernel-rt-debug-debuginfo
Red Hat:rhel_extras_rt:7
From an advisory covering 29 CVEs
before 0:3.10.0-862.rt56.804.el7
0:3.10.0-862.rt56.804.el7
kernel-rt-debug-devel
Red Hat:rhel_extras_rt:7
From an advisory covering 29 CVEs
before 0:3.10.0-862.rt56.804.el7
0:3.10.0-862.rt56.804.el7
kernel-rt-debug-kvm
Red Hat:rhel_extras_rt:7
From an advisory covering 29 CVEs
before 0:3.10.0-862.rt56.804.el7
0:3.10.0-862.rt56.804.el7
kernel-rt-debug-kvm-debuginfo
Red Hat:rhel_extras_rt:7
From an advisory covering 29 CVEs
before 0:3.10.0-862.rt56.804.el7
0:3.10.0-862.rt56.804.el7
kernel-rt-debuginfo
Red Hat:rhel_extras_rt:7
From an advisory covering 29 CVEs
before 0:3.10.0-862.rt56.804.el7
0:3.10.0-862.rt56.804.el7
Show 90 moreShow less
Affected packages
PackageAffectedFixed
kernel-rt-debuginfo-common-x86_64
Red Hat:rhel_extras_rt:7
From an advisory covering 29 CVEs
before 0:3.10.0-862.rt56.804.el7
0:3.10.0-862.rt56.804.el7
kernel-rt-devel
Red Hat:rhel_extras_rt:7
From an advisory covering 29 CVEs
before 0:3.10.0-862.rt56.804.el7
0:3.10.0-862.rt56.804.el7
kernel-rt-doc
Red Hat:rhel_extras_rt:7
From an advisory covering 29 CVEs
before 0:3.10.0-862.rt56.804.el7
0:3.10.0-862.rt56.804.el7
kernel-rt-kvm
Red Hat:rhel_extras_rt:7
From an advisory covering 29 CVEs
before 0:3.10.0-862.rt56.804.el7
0:3.10.0-862.rt56.804.el7
kernel-rt-kvm-debuginfo
Red Hat:rhel_extras_rt:7
From an advisory covering 29 CVEs
before 0:3.10.0-862.rt56.804.el7
0:3.10.0-862.rt56.804.el7
kernel-rt-trace
Red Hat:rhel_extras_rt:7
From an advisory covering 29 CVEs
before 0:3.10.0-862.rt56.804.el7
0:3.10.0-862.rt56.804.el7
kernel-rt-trace-debuginfo
Red Hat:rhel_extras_rt:7
From an advisory covering 29 CVEs
before 0:3.10.0-862.rt56.804.el7
0:3.10.0-862.rt56.804.el7
kernel-rt-trace-devel
Red Hat:rhel_extras_rt:7
From an advisory covering 29 CVEs
before 0:3.10.0-862.rt56.804.el7
0:3.10.0-862.rt56.804.el7
kernel-rt-trace-kvm
Red Hat:rhel_extras_rt:7
From an advisory covering 29 CVEs
before 0:3.10.0-862.rt56.804.el7
0:3.10.0-862.rt56.804.el7
kernel-rt-trace-kvm-debuginfo
Red Hat:rhel_extras_rt:7
From an advisory covering 29 CVEs
before 0:3.10.0-862.rt56.804.el7
0:3.10.0-862.rt56.804.el7
kernel
Red Hat:enterprise_linux:7::client
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-abi-whitelists
Red Hat:enterprise_linux:7::client
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debug
Red Hat:enterprise_linux:7::client
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debug-debuginfo
Red Hat:enterprise_linux:7::client
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debug-devel
Red Hat:enterprise_linux:7::client
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debuginfo
Red Hat:enterprise_linux:7::client
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debuginfo-common-x86_64
Red Hat:enterprise_linux:7::client
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-devel
Red Hat:enterprise_linux:7::client
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-doc
Red Hat:enterprise_linux:7::client
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-headers
Red Hat:enterprise_linux:7::client
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-tools
Red Hat:enterprise_linux:7::client
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-tools-debuginfo
Red Hat:enterprise_linux:7::client
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-tools-libs
Red Hat:enterprise_linux:7::client
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
perf
Red Hat:enterprise_linux:7::client
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
perf-debuginfo
Red Hat:enterprise_linux:7::client
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
python-perf
Red Hat:enterprise_linux:7::client
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
python-perf-debuginfo
Red Hat:enterprise_linux:7::client
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-tools-libs-devel
Red Hat:enterprise_linux:7::client
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel
Red Hat:enterprise_linux:7::computenode
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-abi-whitelists
Red Hat:enterprise_linux:7::computenode
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debug
Red Hat:enterprise_linux:7::computenode
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debug-debuginfo
Red Hat:enterprise_linux:7::computenode
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debug-devel
Red Hat:enterprise_linux:7::computenode
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debuginfo
Red Hat:enterprise_linux:7::computenode
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debuginfo-common-x86_64
Red Hat:enterprise_linux:7::computenode
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-devel
Red Hat:enterprise_linux:7::computenode
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-doc
Red Hat:enterprise_linux:7::computenode
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-headers
Red Hat:enterprise_linux:7::computenode
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-tools
Red Hat:enterprise_linux:7::computenode
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-tools-debuginfo
Red Hat:enterprise_linux:7::computenode
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-tools-libs
Red Hat:enterprise_linux:7::computenode
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
perf
Red Hat:enterprise_linux:7::computenode
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
perf-debuginfo
Red Hat:enterprise_linux:7::computenode
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
python-perf
Red Hat:enterprise_linux:7::computenode
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
python-perf-debuginfo
Red Hat:enterprise_linux:7::computenode
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-tools-libs-devel
Red Hat:enterprise_linux:7::computenode
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-abi-whitelists
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-bootwrapper
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debug
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debug-debuginfo
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debug-devel
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debuginfo
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debuginfo-common-ppc64
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debuginfo-common-ppc64le
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debuginfo-common-s390x
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debuginfo-common-x86_64
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-devel
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-doc
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-headers
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-kdump
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-kdump-debuginfo
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-kdump-devel
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-tools
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-tools-debuginfo
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-tools-libs
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
perf
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
perf-debuginfo
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
python-perf
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
python-perf-debuginfo
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-tools-libs-devel
Red Hat:enterprise_linux:7::server
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel
Red Hat:enterprise_linux:7::workstation
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-abi-whitelists
Red Hat:enterprise_linux:7::workstation
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debug
Red Hat:enterprise_linux:7::workstation
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debug-debuginfo
Red Hat:enterprise_linux:7::workstation
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debug-devel
Red Hat:enterprise_linux:7::workstation
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debuginfo
Red Hat:enterprise_linux:7::workstation
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-debuginfo-common-x86_64
Red Hat:enterprise_linux:7::workstation
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-devel
Red Hat:enterprise_linux:7::workstation
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-doc
Red Hat:enterprise_linux:7::workstation
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-headers
Red Hat:enterprise_linux:7::workstation
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-tools
Red Hat:enterprise_linux:7::workstation
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-tools-debuginfo
Red Hat:enterprise_linux:7::workstation
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-tools-libs
Red Hat:enterprise_linux:7::workstation
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
perf
Red Hat:enterprise_linux:7::workstation
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
perf-debuginfo
Red Hat:enterprise_linux:7::workstation
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
python-perf
Red Hat:enterprise_linux:7::workstation
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
python-perf-debuginfo
Red Hat:enterprise_linux:7::workstation
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
kernel-tools-libs-devel
Red Hat:enterprise_linux:7::workstation
From an advisory covering 33 CVEs
before 0:3.10.0-862.el7
0:3.10.0-862.el7
linux-azure
Ubuntu:16.04:LTS
before 4.13.0-1005.7, plus listed versions
4.11.0-1009.94.11.0-1011.114.11.0-1013.134.11.0-1014.144.11.0-1015.154.11.0-1016.16
4.13.0-1005.7

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2017-15126 is a high vulnerability (CVSS 8.1) in Linux Kernel, published January 14, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.08%, the 90th percentile. Fixed in linux 4.13.10-1.

References

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