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OpenAdvisories

Description

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.

Affected products

VendorProductAffectedFixed
Linux Kernel 3.9 – < 3.9* 3.9*

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 linux 4.17.15-1 —
Debian 13 linux 4.17.15-1 —
Debian 12 linux 4.17.15-1 —
Debian 9 linux 4.9.110-3+deb9u2 DSA-4272-1
Debian 8 linux 3.16.59-1 DLA-1529-1
Debian 8 linux-4.9 4.9.110-3+deb9u2~deb8u1 DLA-1715-1, DLA-1466-1
ReleasePackageFixed inAdvisory
Ubuntu 24.04 LTS linux-raspi-realtime No fix yet —
Ubuntu 22.04 LTS linux-riscv +2 No fix yet —
Ubuntu 20.04 LTS linux-gke +3 No fix yet —
Ubuntu 18.04 LTS linux 4.15.0-32.35 USN-3740-1
Ubuntu 18.04 LTS linux-aws +1 4.15.0-1019.19 USN-3740-1
Ubuntu 18.04 LTS linux-azure 4.15.0-1021.21 USN-3740-1
Ubuntu 18.04 LTS linux-gcp 4.15.0-1017.18 USN-3740-1
Ubuntu 18.04 LTS linux-oem 4.15.0-1015.18 USN-3740-1
Ubuntu 18.04 LTS linux-raspi2 4.15.0-1020.22 USN-3740-1
Ubuntu 16.04 LTS linux 4.4.0-133.159 USN-3741-1
Ubuntu 16.04 LTS linux-aws 4.4.0-1065.75 USN-3741-1
Ubuntu 16.04 LTS linux-azure 4.15.0-1021.21~16.04.1 USN-3740-2
Ubuntu 16.04 LTS linux-euclid 4.4.0-9029.31 —
Ubuntu 16.04 LTS linux-gcp 4.15.0-1017.18~16.04.1 USN-3740-2
Ubuntu 16.04 LTS linux-hwe 4.15.0-32.35~16.04.1 USN-3740-2
Ubuntu 16.04 LTS linux-kvm 4.4.0-1031.37 USN-3741-1
Ubuntu 16.04 LTS linux-raspi2 4.4.0-1094.102 USN-3741-1
Ubuntu 16.04 LTS linux-snapdragon 4.4.0-1098.103 USN-3741-1
Show 2 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 14.04 LTS linux 3.13.0-155.205 USN-3742-1
Ubuntu 14.04 LTS linux-aws 4.4.0-1027.30 USN-3741-2
Ubuntu 14.04 LTS linux-lts-xenial 4.4.0-133.159~14.04.1 USN-3741-2
Ubuntu Pro FIPS-updates 16.04 LTS linux-fips 4.4.0-1008.10 —
ReleasePackageFixed inAdvisory
RHEL 7 kernel-alt +1 4.14.0-115.el7a RHSA-2018:2948
RHEL 7 kernel-rt +10 3.10.0-957.rt56.910.el7 RHSA-2018:3096
RHEL 7 perf +18 3.10.0-957.el7 RHSA-2018:3083, RHSA-2018:2948
RHEL 6 perf +16 2.6.32-754.6.3.el6 RHSA-2018:2846
Show 12 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
RHEL 7.5 EUS perf +18 3.10.0-862.20.2.el7 RHSA-2018:3459
RHEL 7.4 EUS perf +18 3.10.0-693.43.1.el7 RHSA-2018:3540
RHEL 7.3 EUS perf +18 3.10.0-514.58.1.el7 RHSA-2018:2785
RHEL 7.2 TUS perf +12 3.10.0-327.76.1.el7 RHSA-2018:3590
RHEL 7.2 E4S perf +12 3.10.0-327.76.1.el7 RHSA-2018:3590
RHEL 7.2 AUS perf +12 3.10.0-327.76.1.el7 RHSA-2018:3590
RHEL 6.7 EUS perf +16 2.6.32-573.65.2.el6 RHSA-2018:2925
RHEL 6.6 TUS perf +10 2.6.32-504.76.2.el6 RHSA-2018:2924
RHEL 6.6 AUS perf +10 2.6.32-504.76.2.el6 RHSA-2018:2924
RHEL 6.5 AUS perf +10 2.6.32-431.93.2.el6 RHSA-2018:2933
RHEL 6.4 AUS perf +9 2.6.32-358.93.1.el6 RHSA-2018:2791
Red Hat MRG 2 kernel-rt +10 1:3.10.0-693.43.1.rt56.630.el6rt RHSA-2018:3586
ReleasePackageFixed inAdvisory
SLES 15 kernel-azure +2 4.12.14-5.13.1 SUSE-SU-2018:2450-1
SLES 15 kernel-docs +6 4.12.14-25.13.1 SUSE-SU-2018:2380-1
SLES 15 lttng-modules 2.10.0-5.4.2 SUSE-SU-2018:2380-1
SLES 12 SP3 kernel-azure +2 4.4.143-4.13.1 SUSE-SU-2018:2374-1
SLES 12 SP3 kernel-docs +4 4.4.175-94.79.1 SUSE-SU-2019:0541-1
SLES 12 SP2 kernel-syms +2 4.4.121-92.92.1 SUSE-SU-2018:2344-2, SUSE-SU-2018:2344-1
SLES 12 SP2 kgraft-patch-SLE12-SP2_Update_15 12-2.1 SUSE-SU-2018:3787-1
SLES 12 SP2 kgraft-patch-SLE12-SP2_Update_16 +1 11-2.1 SUSE-SU-2018:3787-1
SLES 12 SP2 kgraft-patch-SLE12-SP2_Update_18 +1 9-2.1 SUSE-SU-2018:3792-1
SLES 12 SP2 kgraft-patch-SLE12-SP2_Update_20 8-2.1 SUSE-SU-2018:3792-1
SLES 12 SP2 kgraft-patch-SLE12-SP2_Update_21 +1 7-2.1 SUSE-SU-2018:3792-1
SLES 12 SP2 kgraft-patch-SLE12-SP2_Update_23 5-2.1 SUSE-SU-2018:3792-1
SLES 12 SP2 kgraft-patch-SLE12-SP2_Update_24 1-3.7.1 SUSE-SU-2018:2344-2, SUSE-SU-2018:2344-1
SLES 12 SP2 lttng-modules 2.7.1-9.4.1 SUSE-SU-2018:2344-2, SUSE-SU-2018:2344-1
SLES 12 SP1 kernel-xen +3 3.12.74-60.64.110.1 SUSE-SU-2019:1289-1
SLES 12 SP1 kgraft-patch-SLE12-SP1_Update_26 12-2.1 SUSE-SU-2019:0672-1
SLES 12 SP1 kgraft-patch-SLE12-SP1_Update_27 10-2.1 SUSE-SU-2019:0672-1
SLES 12 SP1 kgraft-patch-SLE12-SP1_Update_28 +1 9-2.1 SUSE-SU-2019:0672-1
SLES 12 SP1 kgraft-patch-SLE12-SP1_Update_30 8-2.1 SUSE-SU-2019:0672-1
SLES 12 SP1 kgraft-patch-SLE12-SP1_Update_31 +1 6-2.1 SUSE-SU-2019:0672-1
SLES 12 SP1 kgraft-patch-SLE12-SP1_Update_33 1-2.3.1 SUSE-SU-2019:1289-1
SLES 12 SP1 lttng-modules 2.7.0-4.4.1 SUSE-SU-2019:1289-1
SLES 12 kernel-ec2 3.12.74-60.64.110.1 SUSE-SU-2019:1289-1
SLES 12 kgraft-patch-SLE12_Update_33 12-2.1 SUSE-SU-2019:0645-1
SLES 12 kgraft-patch-SLE12_Update_34 10-2.1 SUSE-SU-2019:0645-1
SLES 12 kgraft-patch-SLE12_Update_35 +1 9-2.1 SUSE-SU-2019:0645-1
SLES 12 kgraft-patch-SLE12_Update_37 8-2.1 SUSE-SU-2019:0645-1
SLES 12 kgraft-patch-SLE12_Update_38 6-2.1 SUSE-SU-2019:0645-1
Show 8 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLES for SAP 12 SP3 kernel-azure +1 4.4.143-4.13.1 SUSE-SU-2018:2374-1
SLES for SAP 12 SP3 kernel-syms +2 4.4.175-94.79.1 SUSE-SU-2019:0541-1
SLES for SAP 12 SP2 kernel-syms +2 4.4.121-92.92.1 SUSE-SU-2018:2344-1
SLES for SAP 12 SP2 kgraft-patch-SLE12-SP2_Update_15 12-2.1 SUSE-SU-2018:3787-1
SLES for SAP 12 SP2 kgraft-patch-SLE12-SP2_Update_16 +1 11-2.1 SUSE-SU-2018:3787-1
SLES for SAP 12 SP2 kgraft-patch-SLE12-SP2_Update_18 +1 9-2.1 SUSE-SU-2018:3792-1
SLES for SAP 12 SP2 kgraft-patch-SLE12-SP2_Update_20 8-2.1 SUSE-SU-2018:3792-1
SLES for SAP 12 SP2 kgraft-patch-SLE12-SP2_Update_21 +1 7-2.1 SUSE-SU-2018:3792-1
SLES for SAP 12 SP2 kgraft-patch-SLE12-SP2_Update_23 5-2.1 SUSE-SU-2018:3792-1
SLES for SAP 12 SP2 kgraft-patch-SLE12-SP2_Update_24 1-3.7.1 SUSE-SU-2018:2344-1
SLES for SAP 12 SP2 lttng-modules 2.7.1-9.4.1 SUSE-SU-2018:2344-1
SLES for SAP 12 SP1 kernel-xen +3 3.12.74-60.64.110.1 SUSE-SU-2019:1289-1
SLES for SAP 12 SP1 kgraft-patch-SLE12-SP1_Update_26 12-2.1 SUSE-SU-2019:0672-1
SLES for SAP 12 SP1 kgraft-patch-SLE12-SP1_Update_27 10-2.1 SUSE-SU-2019:0672-1
SLES for SAP 12 SP1 kgraft-patch-SLE12-SP1_Update_28 +1 9-2.1 SUSE-SU-2019:0672-1
SLES for SAP 12 SP1 kgraft-patch-SLE12-SP1_Update_30 8-2.1 SUSE-SU-2019:0672-1
SLES for SAP 12 SP1 kgraft-patch-SLE12-SP1_Update_31 +1 6-2.1 SUSE-SU-2019:0672-1
SLES for SAP 12 SP1 kgraft-patch-SLE12-SP1_Update_33 1-2.3.1 SUSE-SU-2019:1289-1
SLES for SAP 12 SP1 lttng-modules 2.7.0-4.4.1 SUSE-SU-2019:1289-1
SLE Real Time 12 SP3 kernel-rt +3 4.4.147-3.20.1 SUSE-SU-2018:2596-1
SLE Live Patching 15 kernel-default 4.12.14-25.13.1 SUSE-SU-2018:2381-1
SLE Live Patching 15 kernel-livepatch-SLE15_Update_0 6-16.2 SUSE-SU-2018:3880-1
SLE Live Patching 15 kernel-livepatch-SLE15_Update_1 +1 6-2.1 SUSE-SU-2018:3881-1
SLE Live Patching 12 SP3 kgraft-patch-SLE12-SP3_Update_10 +1 8-2.1 SUSE-SU-2018:3860-1
SLE Live Patching 12 SP3 kgraft-patch-SLE12-SP3_Update_12 +1 6-2.1 SUSE-SU-2018:3860-1
SLE Live Patching 12 SP3 kgraft-patch-SLE12-SP3_Update_14 +1 5-2.1 SUSE-SU-2018:3860-1
SLE Live Patching 12 SP3 kgraft-patch-SLE12-SP3_Update_23 1-4.7.1 SUSE-SU-2019:0541-1
SLE Live Patching 12 SP3 kgraft-patch-SLE12-SP3_Update_5 +2 11-2.1 SUSE-SU-2018:3865-1
SLE Live Patching 12 SP3 kgraft-patch-SLE12-SP3_Update_8 +1 9-2.1 SUSE-SU-2018:3860-1
SUSE OpenStack Cloud 7 kernel-syms +2 4.4.121-92.92.1 SUSE-SU-2018:2344-1
SUSE OpenStack Cloud 7 kgraft-patch-SLE12-SP2_Update_24 1-3.7.1 SUSE-SU-2018:2344-1
SUSE OpenStack Cloud 7 lttng-modules 2.7.1-9.4.1 SUSE-SU-2018:2344-1
SUSE Enterprise Storage 4 kernel-syms +2 4.4.121-92.92.1 SUSE-SU-2018:2344-1
SUSE Enterprise Storage 4 kgraft-patch-SLE12-SP2_Update_24 1-3.7.1 SUSE-SU-2018:2344-1
SUSE Enterprise Storage 4 lttng-modules 2.7.1-9.4.1 SUSE-SU-2018:2344-1

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2 perf +7 4.14.62-70.117.amzn2 ALAS2-2018-1058

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 7 kernel-uek +5 4.1.12-124.18.5.el7uek ELSA-2018-4196, ELSA-2018-4195
Oracle Linux 7 kernel-uek-tools +3 4.14.35-1818.1.6.el7uek ELSA-2018-4195
Oracle Linux 7 perf +12 3.10.0-957.el7 ELSA-2018-4195, ELSA-2018-3083

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • zeinabmazraani/OverlapCraft ★ 0 · Sep 11, 2026

    An attacker and detector built to escalate against each other around overlapping IP fragments. Three attack modes exploit fragment reassembly in increasingly subtle ways, the last inspired by Fragmen…

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 45

References