Skip to content
Fencer Vulns
high 7.5

CVE-2018-5391 in the critical feed json

The Linux kernel, versions 3.9+, IP implementation is vulnerable to denial of service conditions with low rates of specially modified packets

published 2018-09-06 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-17161

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
32.4%
EPSS 32.4% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

Summary

The Linux kernel, versions 3.9+, is vulnerable to a denial of service attack with low rates of specially modified packets targeting IP fragment re-assembly. An attacker may cause a denial of service condition by sending specially crafted IP fragments. Various vulnerabilities in IP fragmentation have been discovered and fixed over the years. The current vulnerability (CVE-2018-5391) became exploitable in the Linux kernel with the increase of the IP fragment reassembly queue size.

Patch / fix

  • f5 big-ip_access_policy_manager 11.6.5.1, 12.1.5, 13.1.3, 14.0.1.1, 14.1.2.4
  • f5 big-ip_advanced_firewall_manager 11.6.5.1, 12.1.5, 13.1.3, 14.0.1.1, 14.1.2.4
  • f5 big-ip_analytics 11.6.5.1, 12.1.5, 13.1.3, 14.0.1.1, 14.1.2.4
  • f5 big-ip_application_acceleration_manager 11.6.5.1, 12.1.5, 13.1.3, 14.0.1.1, 14.1.2.4
  • f5 big-ip_application_security_manager 11.6.5.1, 12.1.5, 13.1.3, 14.0.1.1, 14.1.2.4
  • f5 big-ip_domain_name_system 11.6.5.1, 12.1.5, 13.1.3, 14.0.1.1, 14.1.2.4
  • f5 big-ip_edge_gateway 11.6.5.1, 12.1.5, 13.1.3, 14.0.1.1, 14.1.2.4
  • f5 big-ip_fraud_protection_service 11.6.5.1, 12.1.5, 13.1.3, 14.0.1.1, 14.1.2.4
  • f5 big-ip_global_traffic_manager 11.6.5.1, 12.1.5, 13.1.3, 14.0.1.1, 14.1.2.4
  • f5 big-ip_link_controller 11.6.5.1, 12.1.5, 13.1.3, 14.0.1.1, 14.1.2.4
  • f5 big-ip_local_traffic_manager 11.6.5.1, 12.1.5, 13.1.3, 14.0.1.1, 14.1.2.4
  • f5 big-ip_policy_enforcement_manager 11.6.5.1, 12.1.5, 13.1.3, 14.0.1.1, 14.1.2.4
  • f5 big-ip_webaccelerator 11.6.5.1, 12.1.5, 13.1.3, 14.0.1.1, 14.1.2.4
  • siemens ruggedcom_rm1224_firmware 6.1
  • siemens ruggedcom_rox_ii_firmware 2.13.3
  • siemens scalance_m-800_firmware 6.1
  • siemens scalance_s615_firmware 6.1
  • siemens scalance_sc-600_firmware 2.0
  • siemens scalance_w1700_ieee_802.11ac_firmware 2.0
  • siemens scalance_w700_ieee_802.11a/b/g/n_firmware 6.4
  • linux Debian 14, Debian 13, Debian 12 4.17.15-1

debian advisories DEBIAN-CVE-2018-5391

  • linux Ubuntu 14.04 LTS 3.13.0-155.205
  • linux Ubuntu 16.04 LTS 4.4.0-133.159
  • linux Ubuntu 18.04 LTS 4.15.0-32.35
  • linux-aws Ubuntu 14.04 LTS 4.4.0-1027.30
  • linux-aws Ubuntu 16.04 LTS 4.4.0-1065.75
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1019.19
  • linux-gcp Ubuntu 16.04 LTS 4.15.0-1017.18~16.04.1
  • linux-gcp Ubuntu 18.04 LTS 4.15.0-1017.18

ubuntu advisories UBUNTU-CVE-2018-5391

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-alt RHEL 7 4.14.0-115.el7a
  • perf RHEL 7 4.14.0-115.el7a
  • kernel RHEL 7 4.14.0-115.el7a
  • python-perf RHEL 7 4.14.0-115.el7a
  • kernel-tools RHEL 7 4.14.0-115.el7a
  • kernel-tools-libs RHEL 7 4.14.0-115.el7a
  • kernel-bootwrapper RHEL 7 4.14.0-115.el7a
  • kernel-abi-whitelists RHEL 7 4.14.0-115.el7a

red hat advisories RHSA-2018:2948RHSA-2018:3096RHSA-2018:3083RHSA-2018:3590RHSA-2018:2933RHSA-2018:2925

  • kernel-ec2 SLE Module for Public Cloud 12 3.12.74-60.64.110.1
  • kernel-syms SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 4.4.175-94.79.1
  • kernel-source SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 4.4.175-94.79.1
  • kernel-default SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 +2 more 4.4.175-94.79.1
  • kernel-obs-build SLE Software Development Kit 12 SP3 4.4.175-94.79.1
  • kernel-syms SLES 12 SP2-BCL, OpenStack Cloud 7, Enterprise Storage 4 +2 more 4.4.121-92.92.1
  • kernel-source SLES 12 SP2-BCL, OpenStack Cloud 7, Enterprise Storage 4 +2 more 4.4.121-92.92.1
  • lttng-modules SLES 12 SP2-BCL, OpenStack Cloud 7, Enterprise Storage 4 +2 more 2.7.1-9.4.1

suse advisories SUSE-SU-2019:1289-1SUSE-SU-2019:0672-1SUSE-SU-2019:0645-1SUSE-SU-2019:0541-1SUSE-SU-2018:3881-1SUSE-SU-2018:3880-1

  • linux Arch Linux 4.19.arch1-1
  • linux-zen Arch Linux 4.19.1.zen1-1
  • linux-hardened Arch Linux 4.19.4.a-1
  • linux-lts Arch Linux 4.14.71-1

arch linux advisories AVG-760AVG-761AVG-762AVG-767

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-2018-5391 updated cvss 7.5

kernel: IP fragments with random offsets allow a remote denial of service (FragmentSmack)

  • Red Hat Enterprise Linux 5 kernel
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-957.el7, kernel 3.10.0-957.el7, bpftool 3.10.0-957.el7, python-perf 3.10.0-957.el7, kernel-tools 3.10.0-957.el7, kernel-tools-libs 3.10.0-957.el7, +2 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-957.el7 Red Hat Enterprise Linux ComputeNode (v. 7) perf 3.10.0-957.el7, kernel 3.10.0-957.el7, bpftool 3.10.0-957.el7, python-perf 3.10.0-957.el7, kernel-tools 3.10.0-957.el7, kernel-tools-libs 3.10.0-957.el7, +2 more
    fixed: vendor fix RHSA-2018:3083
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.3) perf 3.10.0-514.58.1.el7, kernel 3.10.0-514.58.1.el7, python-perf 3.10.0-514.58.1.el7, kernel-tools 3.10.0-514.58.1.el7, kernel-tools-libs 3.10.0-514.58.1.el7, kernel-abi-whitelists 3.10.0-514.58.1.el7, +1 more
    fixed: vendor fix RHSA-2018:2785
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.4) perf 3.10.0-693.43.1.el7, kernel 3.10.0-693.43.1.el7, python-perf 3.10.0-693.43.1.el7, kernel-tools 3.10.0-693.43.1.el7, kernel-tools-libs 3.10.0-693.43.1.el7, kernel-abi-whitelists 3.10.0-693.43.1.el7, +1 more
    fixed: vendor fix RHSA-2018:3540
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.5) perf 3.10.0-862.20.2.el7, kernel 3.10.0-862.20.2.el7, python-perf 3.10.0-862.20.2.el7, kernel-tools 3.10.0-862.20.2.el7, kernel-tools-libs 3.10.0-862.20.2.el7, kernel-abi-whitelists 3.10.0-862.20.2.el7, +1 more
    fixed: vendor fix RHSA-2018:3459
  • Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-957.el7
    fixed: vendor fix RHSA-2018:3083
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.3) kernel-debuginfo-common-x86_64 3.10.0-514.58.1.el7
    fixed: vendor fix RHSA-2018:2785
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4) kernel-debuginfo-common-x86_64 3.10.0-693.43.1.el7
    fixed: vendor fix RHSA-2018:3540
show 25 more
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5) kernel-debuginfo-common-x86_64 3.10.0-862.20.2.el7
    fixed: vendor fix RHSA-2018:3459
  • Red Hat Enterprise Linux Desktop (v. 6) perf 2.6.32-754.6.3.el6, kernel 2.6.32-754.6.3.el6, kernel-firmware 2.6.32-754.6.3.el6, kernel-abi-whitelists 2.6.32-754.6.3.el6, kernel-debuginfo-common-i686 2.6.32-754.6.3.el6, kernel-debuginfo-common-x86_64 2.6.32-754.6.3.el6 Red Hat Enterprise Linux Desktop Optional (v. 6) python-perf 2.6.32-754.6.3.el6, kernel-debuginfo-common-i686 2.6.32-754.6.3.el6, kernel-debuginfo-common-x86_64 2.6.32-754.6.3.el6
    fixed: vendor fix RHSA-2018:2846
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) perf 3.10.0-957.el7, perf 4.14.0-115.el7a, kernel 3.10.0-957.el7, kernel 4.14.0-115.el7a, kernel-alt 4.14.0-115.el7a, python-perf 3.10.0-957.el7, +13 more Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) kernel-debuginfo-common-ppc64le 3.10.0-957.el7, kernel-debuginfo-common-ppc64le 4.14.0-115.el7a
    fixed: vendor fix RHSA-2018:3083
  • Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt 3.10.0-957.rt56.910.el7, kernel-rt-trace 3.10.0-957.rt56.910.el7 Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt 3.10.0-957.rt56.910.el7, kernel-rt-kvm 3.10.0-957.rt56.910.el7, kernel-rt-trace 3.10.0-957.rt56.910.el7, kernel-rt-debug-kvm 3.10.0-957.rt56.910.el7, kernel-rt-trace-kvm 3.10.0-957.rt56.910.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-957.rt56.910.el7
    fixed: vendor fix RHSA-2018:3096
  • Red Hat Enterprise Linux HPC Node (v. 6) perf 2.6.32-754.6.3.el6, kernel 2.6.32-754.6.3.el6, kernel-firmware 2.6.32-754.6.3.el6, kernel-abi-whitelists 2.6.32-754.6.3.el6, kernel-debuginfo-common-i686 2.6.32-754.6.3.el6, kernel-debuginfo-common-x86_64 2.6.32-754.6.3.el6
    fixed: vendor fix RHSA-2018:2846
  • Red Hat Enterprise Linux HPC Node EUS (v. 6.7) perf 2.6.32-573.65.2.el6, kernel 2.6.32-573.65.2.el6, kernel-firmware 2.6.32-573.65.2.el6, kernel-abi-whitelists 2.6.32-573.65.2.el6, kernel-debuginfo-common-i686 2.6.32-573.65.2.el6, kernel-debuginfo-common-x86_64 2.6.32-573.65.2.el6
    fixed: vendor fix RHSA-2018:2925
  • Red Hat Enterprise Linux HPC Node Optional (v. 6) python-perf 2.6.32-754.6.3.el6, kernel-debuginfo-common-x86_64 2.6.32-754.6.3.el6
    fixed: vendor fix RHSA-2018:2846
  • Red Hat Enterprise Linux HPC Node Optional EUS (v. 6.7) python-perf 2.6.32-573.65.2.el6, kernel-debuginfo-common-x86_64 2.6.32-573.65.2.el6
    fixed: vendor fix RHSA-2018:2925
  • Red Hat Enterprise Linux Server (v. 6) perf 2.6.32-754.6.3.el6, kernel 2.6.32-754.6.3.el6, kernel-kdump 2.6.32-754.6.3.el6, kernel-firmware 2.6.32-754.6.3.el6, kernel-bootwrapper 2.6.32-754.6.3.el6, kernel-abi-whitelists 2.6.32-754.6.3.el6, +4 more
    fixed: vendor fix RHSA-2018:2846
  • Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-957.el7, kernel 3.10.0-957.el7, bpftool 3.10.0-957.el7, python-perf 3.10.0-957.el7, kernel-kdump 3.10.0-957.el7, kernel-tools 3.10.0-957.el7, +7 more
    fixed: vendor fix RHSA-2018:3083
  • Red Hat Enterprise Linux Server AUS (v. 6.4) perf 2.6.32-358.93.1.el6, kernel 2.6.32-358.93.1.el6, kernel-firmware 2.6.32-358.93.1.el6, kernel-debuginfo-common-x86_64 2.6.32-358.93.1.el6
    fixed: vendor fix RHSA-2018:2791
  • Red Hat Enterprise Linux Server AUS (v. 6.5) perf 2.6.32-431.93.2.el6, kernel 2.6.32-431.93.2.el6, kernel-firmware 2.6.32-431.93.2.el6, kernel-abi-whitelists 2.6.32-431.93.2.el6, kernel-debuginfo-common-x86_64 2.6.32-431.93.2.el6
    fixed: vendor fix RHSA-2018:2933
  • Red Hat Enterprise Linux Server AUS (v. 6.6) perf 2.6.32-504.76.2.el6, kernel 2.6.32-504.76.2.el6, kernel-firmware 2.6.32-504.76.2.el6, kernel-abi-whitelists 2.6.32-504.76.2.el6, kernel-debuginfo-common-x86_64 2.6.32-504.76.2.el6
    fixed: vendor fix RHSA-2018:2924
  • Red Hat Enterprise Linux Server AUS (v. 7.2) perf 3.10.0-327.76.1.el7, kernel 3.10.0-327.76.1.el7, python-perf 3.10.0-327.76.1.el7, kernel-tools 3.10.0-327.76.1.el7, kernel-tools-libs 3.10.0-327.76.1.el7, kernel-abi-whitelists 3.10.0-327.76.1.el7, +1 more Red Hat Enterprise Linux Server E4S (v. 7.2) perf 3.10.0-327.76.1.el7, kernel 3.10.0-327.76.1.el7, python-perf 3.10.0-327.76.1.el7, kernel-tools 3.10.0-327.76.1.el7, kernel-tools-libs 3.10.0-327.76.1.el7, kernel-abi-whitelists 3.10.0-327.76.1.el7, +1 more
    fixed: vendor fix RHSA-2018:3590
  • Red Hat Enterprise Linux Server EUS (v. 6.7) perf 2.6.32-573.65.2.el6, kernel 2.6.32-573.65.2.el6, kernel-kdump 2.6.32-573.65.2.el6, kernel-firmware 2.6.32-573.65.2.el6, kernel-bootwrapper 2.6.32-573.65.2.el6, kernel-abi-whitelists 2.6.32-573.65.2.el6, +4 more
    fixed: vendor fix RHSA-2018:2925
  • Red Hat Enterprise Linux Server EUS (v. 7.3) perf 3.10.0-514.58.1.el7, kernel 3.10.0-514.58.1.el7, python-perf 3.10.0-514.58.1.el7, kernel-kdump 3.10.0-514.58.1.el7, kernel-tools 3.10.0-514.58.1.el7, kernel-tools-libs 3.10.0-514.58.1.el7, +6 more
    fixed: vendor fix RHSA-2018:2785
  • Red Hat Enterprise Linux Server EUS (v. 7.4) perf 3.10.0-693.43.1.el7, kernel 3.10.0-693.43.1.el7, python-perf 3.10.0-693.43.1.el7, kernel-kdump 3.10.0-693.43.1.el7, kernel-tools 3.10.0-693.43.1.el7, kernel-tools-libs 3.10.0-693.43.1.el7, +6 more
    fixed: vendor fix RHSA-2018:3540
  • Red Hat Enterprise Linux Server EUS (v. 7.5) perf 3.10.0-862.20.2.el7, kernel 3.10.0-862.20.2.el7, python-perf 3.10.0-862.20.2.el7, kernel-kdump 3.10.0-862.20.2.el7, kernel-tools 3.10.0-862.20.2.el7, kernel-tools-libs 3.10.0-862.20.2.el7, +6 more
    fixed: vendor fix RHSA-2018:3459
  • Red Hat Enterprise Linux Server Optional (v. 6) python-perf 2.6.32-754.6.3.el6, kernel-debuginfo-common-i686 2.6.32-754.6.3.el6, kernel-debuginfo-common-ppc64 2.6.32-754.6.3.el6, kernel-debuginfo-common-s390x 2.6.32-754.6.3.el6, kernel-debuginfo-common-x86_64 2.6.32-754.6.3.el6
    fixed: vendor fix RHSA-2018:2846
  • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-957.el7, kernel-debuginfo-common-x86_64 3.10.0-957.el7, kernel-debuginfo-common-ppc64le 3.10.0-957.el7
    fixed: vendor fix RHSA-2018:3083
  • Red Hat Enterprise Linux Server Optional AUS (v. 6.4) kernel 2.6.32-358.93.1.el6, python-perf 2.6.32-358.93.1.el6, kernel-debuginfo-common-x86_64 2.6.32-358.93.1.el6
    fixed: vendor fix RHSA-2018:2791
  • Red Hat Enterprise Linux Server Optional AUS (v. 6.5) kernel 2.6.32-431.93.2.el6, python-perf 2.6.32-431.93.2.el6, kernel-debuginfo-common-x86_64 2.6.32-431.93.2.el6
    fixed: vendor fix RHSA-2018:2933
  • Red Hat Enterprise Linux Server Optional AUS (v. 6.6) python-perf 2.6.32-504.76.2.el6, kernel-debuginfo-common-x86_64 2.6.32-504.76.2.el6
    fixed: vendor fix RHSA-2018:2924
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.2) kernel-debuginfo-common-x86_64 3.10.0-327.76.1.el7 Red Hat Enterprise Linux Server Optional E4S (v. 7.2) kernel-debuginfo-common-x86_64 3.10.0-327.76.1.el7
    fixed: vendor fix RHSA-2018:3590
  • Red Hat Enterprise Linux Server Optional EUS (v. 6.7) python-perf 2.6.32-573.65.2.el6, kernel-debuginfo-common-i686 2.6.32-573.65.2.el6, kernel-debuginfo-common-ppc64 2.6.32-573.65.2.el6, kernel-debuginfo-common-s390x 2.6.32-573.65.2.el6, kernel-debuginfo-common-x86_64 2.6.32-573.65.2.el6
    fixed: vendor fix RHSA-2018:2925

12 more fixed, 6 more not affected in the full advisory

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

cisa ICSA-20-105-05 updated cvss 7.5

Siemens RUGGEDCOM, SCALANCE, SIMATIC, SINEMA (Update B)

  • Siemens RUGGEDCOM RM1224 <V6.1
    affected: fixed in V6.1
  • Siemens RUGGEDCOM ROX II <V2.13.3
    affected: fixed in V2.13.3
  • Siemens SCALANCE M-800 / S615 <V6.1
    affected: fixed in V6.1
  • Siemens SCALANCE SC-600 <V2.0
    affected: fixed in V2.0
  • Siemens SCALANCE W700 IEEE 802.11a/b/g/n <V6.4
    affected: fixed in V6.4
  • Siemens SCALANCE W1700 IEEE 802.11ac <V2.0
    affected: fixed in V2.0
  • Siemens SIMATIC NET CP 1242-7 <V3.2 Siemens SIMATIC NET CP 1243-1 (incl.'SIPLUS variants) <V3.2 Siemens SIMATIC NET CP 1243-7 LTE EU <V3.2 Siemens SIMATIC NET CP 1243-7 LTE US <V3.2 Siemens SIMATIC NET CP 1243-8 IRC <V3.2
    affected: fixed in V3.2
  • Siemens SIMATIC NET CP 1542SP-1 <V2.1 Siemens SIMATIC NET CP 1542SP-1 IRC (incl.'SIPLUS variants) <V2.1
    affected: fixed in V2.1
show 4 more
  • Siemens SIMATIC NET CP 1543-1 (incl.'SIPLUS variants) <V2.2
    affected: fixed in V2.2
  • Siemens SIMATIC NET CP 1543SP-1 (incl.'SIPLUS variants) <V2.1
    affected: fixed in V2.1
  • Siemens SIMATIC RF185C <V1.3 Siemens SIMATIC RF186C <V1.3 Siemens SIMATIC RF186CI <V1.3 Siemens SIMATIC RF188C <V1.3 Siemens SIMATIC RF188CI <V1.3
    affected: fixed in V1.3
  • Siemens SINEMA Remote Connect Server >V1.1, <V2.0.1
    affected: fixed in V2.1

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

32.45% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

  • Linux Kernel

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-20 Improper Input Validation
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.