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Fencer Vulns
medium 4.7

CVE-2017-18224 json

In the Linux kernel before 4.15, fs/ocfs2/aops.c omits use of a semaphore and consequently has a race condition for access to the extent tr…

published 2018-03-12 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-9356

cvss
4.7
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 19%
public exploits
0
none known

Summary

In the Linux kernel before 4.15, fs/ocfs2/aops.c omits use of a semaphore and consequently has a race condition for access to the extent tree during read operations in DIRECT mode, which allows local users to cause a denial of service (BUG) by modifying a certain e_cpos field.

Patch / fix

  • linux linux_kernel 4.15
  • linux Debian 14, Debian 13, Debian 12 4.15.4-1

debian advisories DEBIAN-CVE-2017-18224

  • linux-gcp Ubuntu 16.04 LTS 4.15.0-1014.14~16.04.1
  • linux-hwe Ubuntu 16.04 LTS 4.15.0-24.26~16.04.1
  • linux-azure Ubuntu 16.04 LTS 4.15.0-1013.13~16.04.2

ubuntu advisories UBUNTU-CVE-2017-18224

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-syms SLES for SAP 12 SP4, SLES 12 SP4, SLED 12 SP4 4.12.14-95.3.1
  • kernel-source SLES for SAP 12 SP4, SLES 12 SP4, SLED 12 SP4 4.12.14-95.3.1
  • kernel-default SLES for SAP 12 SP4, SLES 12 SP4, SLED 12 SP4 +2 more 4.12.14-95.3.1
  • kernel-obs-build SLE Software Development Kit 12 SP4 4.12.14-95.3.2
  • kernel-azure SLE Module for Public Cloud 15 4.12.14-5.16.1
  • kernel-syms-azure SLE Module for Public Cloud 15 4.12.14-5.16.1
  • kernel-source-azure SLE Module for Public Cloud 15 4.12.14-5.16.1
  • kernel-azure SLES for SAP 12 SP4, SLES 12 SP4 4.12.14-6.3.1

suse advisories SUSE-SU-2018:4069-1SUSE-SU-2018:4072-1SUSE-SU-2018:3961-1SUSE-SU-2018:3934-1SUSE-SU-2018:3589-1SUSE-SU-2018:3593-1

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-2017-18224 updated cvss 5.5

kernel: race condition due to concurrent access to extent tree in fs/ocfs2/aops.c

  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, kernel-alt, python-perf, +9 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-core, kernel-tools, python3-perf, +17 more Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    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

0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 4.7 CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 1.9 AV:L/AC:M/Au:N/C:N/I:N/A:P

Classification

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

References

Sources

Fencer Vulns 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.