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Fencer Vulns
medium 5.5

CVE-2017-18241 json

fs/f2fs/segment.c in the Linux kernel before 4.13 allows local users to cause a denial of service (NULL pointer dereference and panic) by u…

published 2018-03-21 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-9372

cvss
5.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 35%
public exploits
0
none known

Summary

fs/f2fs/segment.c in the Linux kernel before 4.13 allows local users to cause a denial of service (NULL pointer dereference and panic) by using a noflush_merge option that triggers a NULL value for a flush_cmd_control data structure.

Patch / fix

  • linux linux_kernel 4.13
  • linux Debian 14, Debian 13, Debian 12 4.13.4-1

debian advisories DEBIAN-CVE-2017-18241

  • linux Ubuntu 16.04 LTS 4.4.0-143.169
  • linux-aws Ubuntu 14.04 LTS 4.4.0-1039.42
  • linux-aws Ubuntu 16.04 LTS 4.4.0-1077.87
  • linux-gcp Ubuntu 16.04 LTS 4.13.0-1002.5
  • linux-hwe Ubuntu 16.04 LTS 4.13.0-32.35~16.04.1
  • linux-kvm Ubuntu 16.04 LTS 4.4.0-1041.47
  • linux-azure Ubuntu 16.04 LTS 4.13.0-1005.7
  • linux-raspi2 Ubuntu 16.04 LTS 4.4.0-1104.112

ubuntu advisories UBUNTU-CVE-2017-18241

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 12 SP2-BCL, OpenStack Cloud 7, Enterprise Storage 4 +2 more 4.4.121-92.85.1
  • kernel-source SLES 12 SP2-BCL, OpenStack Cloud 7, Enterprise Storage 4 +2 more 4.4.121-92.85.1
  • kernel-default SLES 12 SP2-BCL, OpenStack Cloud 7, Enterprise Storage 4 +2 more 4.4.121-92.85.1
  • kgraft-patch-SLE12-SP2_Update_23 SLES 12 SP2-BCL, OpenStack Cloud 7, Enterprise Storage 4 +2 more 1-3.5.1
  • kernel-rt SLE Real Time 12 SP3 4.4.138-3.14.1
  • kernel-syms-rt SLE Real Time 12 SP3 4.4.138-3.14.1
  • kernel-rt_debug SLE Real Time 12 SP3 4.4.138-3.14.1
  • kernel-source-rt SLE Real Time 12 SP3 4.4.138-3.14.1

suse advisories SUSE-SU-2018:1855-2SUSE-SU-2018:1855-1SUSE-SU-2018:1816-1SUSE-SU-2018:1772-1

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-2017-18241 updated cvss 5.5

kernel: Null pointer dereference in fs/f2fs/segment.c via mounting fs with noflush_merge option allows local denial of service

  • 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

0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 5.5 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.9 AV:L/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
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.