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Fencer Intel
medium 4.7

CVE-2014-8086 json

Race condition in the ext4_file_write_iter function in fs/ext4/file.c in the Linux kernel through 3.17 allows local users to cause a denial…

published 2014-10-13 12 y ago modified 2026-06-17 4 mo ago also EUVD-2014-7935

cvss
4.7
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

Summary

Race condition in the ext4_file_write_iter function in fs/ext4/file.c in the Linux kernel through 3.17 allows local users to cause a denial of service (file unavailability) via a combination of a write action and an F_SETFL fcntl operation for the O_DIRECT flag.

Patch / fix

  • linux Debian 14, Debian 13, Debian 12 3.16.7-ckt2-1

debian advisories DEBIAN-CVE-2014-8086

  • linux-lts-utopic Ubuntu 14.04 LTS 3.16.0-26.35~14.04.1

ubuntu advisories UBUNTU-CVE-2014-8086

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 7 3.10.0-229.el7
  • perf RHEL 7 3.10.0-229.el7
  • python-perf RHEL 7 3.10.0-229.el7
  • kernel-kdump RHEL 7 3.10.0-229.el7
  • kernel-tools RHEL 7 3.10.0-229.el7
  • kernel-tools-libs RHEL 7 3.10.0-229.el7
  • kernel-bootwrapper RHEL 7 3.10.0-229.el7
  • kernel-abi-whitelists RHEL 7 3.10.0-229.el7

red hat advisories RHSA-2015:0290RHSA-2015:0694

  • kernel-ec2 SLE Module for Public Cloud 12 3.12.43-52.6.1
  • kernel-xen SLES for SAP 12, SLES 12, SLED 12 3.12.43-52.6.1
  • kernel-syms SLES for SAP 12, SLES 12, SLED 12 3.12.43-52.6.1
  • kernel-source SLES for SAP 12, SLES 12, SLED 12 3.12.43-52.6.1
  • kernel-default SLES for SAP 12, SLES 12, SLED 12 +1 more 3.12.43-52.6.1
  • kernel-obs-build SLE Software Development Kit 12 3.12.43-52.6.2
  • kernel-ec2 SLES 11 SP2-LTSS 3.0.101-0.7.37.1
  • kernel-pae SLES 11 SP2-LTSS 3.0.101-0.7.37.1

suse advisories SUSE-SU-2015:1478-1SUSE-SU-2015:1071-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2014-8086 updated cvss 4.7

Kernel: fs: ext4 race condition

  • Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-229.el7, kernel 3.10.0-229.el7, kernel-tools 3.10.0-229.el7, kernel-tools-libs 3.10.0-229.el7, kernel-abi-whitelists 3.10.0-229.el7, kernel-debuginfo-common-x86_64 3.10.0-229.el7 Red Hat Enterprise Linux Client Optional (v. 7) python-perf 3.10.0-229.el7, kernel-debuginfo-common-x86_64 3.10.0-229.el7 Red Hat Enterprise Linux ComputeNode (v. 7) perf 3.10.0-229.el7, kernel 3.10.0-229.el7, kernel-tools 3.10.0-229.el7, kernel-tools-libs 3.10.0-229.el7, kernel-abi-whitelists 3.10.0-229.el7, kernel-debuginfo-common-x86_64 3.10.0-229.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) python-perf 3.10.0-229.el7, kernel-debuginfo-common-x86_64 3.10.0-229.el7 Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-229.el7, kernel 3.10.0-229.el7, kernel-kdump 3.10.0-229.el7, kernel-tools 3.10.0-229.el7, kernel-tools-libs 3.10.0-229.el7, kernel-bootwrapper 3.10.0-229.el7, +4 more Red Hat Enterprise Linux Server Optional (v. 7) python-perf 3.10.0-229.el7, kernel-debuginfo-common-ppc64 3.10.0-229.el7, kernel-debuginfo-common-s390x 3.10.0-229.el7, kernel-debuginfo-common-x86_64 3.10.0-229.el7
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-229.el7, kernel 3.10.0-229.el7, kernel-tools 3.10.0-229.el7, kernel-tools-libs 3.10.0-229.el7, kernel-abi-whitelists 3.10.0-229.el7, kernel-debuginfo-common-x86_64 3.10.0-229.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) python-perf 3.10.0-229.el7, kernel-debuginfo-common-x86_64 3.10.0-229.el7
    fixed: vendor fix RHSA-2015:0290
  • Red Hat MRG Realtime for RHEL 6 Server v.2 kernel-rt 3.10.0-229.rt56.144.el6rt, kernel-rt-trace 3.10.0-229.rt56.144.el6rt, kernel-rt-vanilla 3.10.0-229.rt56.144.el6rt, kernel-rt-firmware 3.10.0-229.rt56.144.el6rt, kernel-rt-debuginfo-common-x86_64 3.10.0-229.rt56.144.el6rt
    fixed: vendor fix RHSA-2015:0694
  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • lkml.org https://lkml.org/lkml/2014/10/8/545 referenced PoC, tagged "exploit" by a source, unverified
  • spinics.net http://www.spinics.net/lists/linux-ext4/msg45683.html referenced PoC, tagged "exploit" by a source, unverified
  • lkml.org https://lkml.org/lkml/2014/10/9/129 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.7 AV:L/AC:M/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.