Description
The tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c in the Linux kernel before 4.11, and 4.9.x before 4.9.36, allows remote attackers to cause a denial of service (use-after-free and memory corruption) or possibly have unspecified other impact by leveraging the presence of xt_TCPMSS in an iptables action.
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.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 4.11.6-1 | — |
| Debian 13 | linux | 4.11.6-1 | — |
| Debian 12 | linux | 4.11.6-1 | — |
| Debian 8 | linux | 3.16.56-1 | DSA-4187-1 |
| Debian 7 | linux | 3.2.101-1 | DLA-1369-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-gcp-6.11 +4 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +3 | No fix yet | — |
| Ubuntu 16.04 LTS | linux | 4.4.0-89.112 | — |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1028.37 | — |
| Ubuntu 16.04 LTS | linux-gcp | 4.13.0-1002.5 | — |
| Ubuntu 16.04 LTS | linux-gke | 4.4.0-1024.24 | — |
| Ubuntu 16.04 LTS | linux-hwe | 4.13.0-32.35~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1067.75 | — |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1069.74 | — |
| Ubuntu 14.04 LTS | linux | 3.13.0-142.191 | USN-3583-1 |
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-89.112~14.04.1 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | linux-azure-fde-5.15 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | kernel-rt +10 | 3.10.0-862.rt56.804.el7 | RHSA-2018:0676 |
| RHEL 7 | perf +18 | 3.10.0-862.el7 | RHSA-2018:1062 |
| RHEL 6 | perf +16 | 2.6.32-696.28.1.el6 | RHSA-2018:1319 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7.4 EUS | perf +18 | 3.10.0-693.25.2.el7 | RHSA-2018:1130 |
| RHEL 7.3 EUS | perf +18 | 3.10.0-514.51.1.el7 | RHSA-2018:1737 |
| Red Hat MRG 2 | kernel-rt +10 | 1:3.10.0-693.25.2.rt56.612.el6rt | RHSA-2018:1170 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | kernel-default +1 | 4.4.114-94.11.3 | SUSE-SU-2018:0383-1 |
| SLES 12 SP3 | kernel-docs | 4.4.114-94.11.4 | SUSE-SU-2018:0383-1 |
| SLES 12 SP3 | kernel-syms +1 | 4.4.114-94.11.2 | SUSE-SU-2018:0383-1 |
| SLES 12 SP2 | kernel-docs | 4.4.114-92.64.2 | SUSE-SU-2018:0416-1 |
| SLES 12 SP2 | kernel-syms +3 | 4.4.114-92.64.1 | SUSE-SU-2018:0416-1 |
| SLES 12 SP1 | kernel-xen +3 | 3.12.74-60.64.85.1 | SUSE-SU-2018:0848-1 |
| SLES 12 SP1 | kgraft-patch-SLE12-SP1_Update_26 | 1-2.3.1 | SUSE-SU-2018:0848-1 |
| SLES 12 | kernel-ec2 +4 | 3.12.61-52.125.1 | SUSE-SU-2018:0848-1, SUSE-SU-2018:0834-1 |
| SLES 12 | kgraft-patch-SLE12_Update_33 | 1-1.3.1 | SUSE-SU-2018:0834-1 |
| SLES 11 SP4 | cluster-network | 1.4-2.32.4.6 | SUSE-SU-2018:0555-1 |
| SLES 11 SP4 | drbd | 8.4.4-0.27.4.2 | SUSE-SU-2018:0555-1 |
| SLES 11 SP4 | drbd-kmp | 8.4.4-0.27.4.6 | SUSE-SU-2018:0555-1 |
| SLES 11 SP4 | gfs2 | 2-0.24.4.6 | SUSE-SU-2018:0555-1 |
| SLES 11 SP4 | kernel-ec2 +9 | 3.0.101-108.35.1 | SUSE-SU-2018:0555-1 |
| SLES 11 SP4 | ocfs2 | 1.6-0.28.5.6 | SUSE-SU-2018:0555-1 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP3 | kernel-ec2 +7 | 3.0.101-0.47.106.19.1 | SUSE-SU-2018:0660-1 |
| SLES for SAP 12 SP3 | kernel-default | 4.4.114-94.11.3 | SUSE-SU-2018:0383-1 |
| SLES for SAP 12 SP3 | kernel-syms +1 | 4.4.114-94.11.2 | SUSE-SU-2018:0383-1 |
| SLES for SAP 12 SP2 | kernel-syms +2 | 4.4.114-92.64.1 | SUSE-SU-2018:0416-1 |
| SLES for SAP 12 SP1 | kernel-xen +3 | 3.12.74-60.64.85.1 | SUSE-SU-2018:0848-1 |
| SLES for SAP 12 SP1 | kgraft-patch-SLE12-SP1_Update_26 | 1-2.3.1 | SUSE-SU-2018:0848-1 |
| SLES for SAP 11 SP4 | kernel-ec2 +8 | 3.0.101-108.35.1 | SUSE-SU-2018:0555-1 |
| SLE Real Time 12 SP3 | kernel-rt +3 | 4.4.120-3.8.1 | SUSE-SU-2018:0986-1 |
| SLE Real Time 12 SP2 | kernel-rt +3 | 4.4.114-27.1 | SUSE-SU-2018:0482-1 |
| SLE Real Time 11 SP4 | cluster-network | 1.4-2.32.4.6 | SUSE-SU-2018:0555-1 |
| SLE Real Time 11 SP4 | drbd-kmp | 8.4.4-0.27.4.6 | SUSE-SU-2018:0555-1 |
| SLE Real Time 11 SP4 | gfs2 | 2-0.24.4.6 | SUSE-SU-2018:0555-1 |
| SLE Real Time 11 SP4 | kernel-rt +3 | 3.0.101.rt130-69.21.1 | SUSE-SU-2018:0841-1 |
| SLE Real Time 11 SP4 | ocfs2 | 1.6-0.28.5.6 | SUSE-SU-2018:0555-1 |
| SLE Live Patching 12 SP3 | kgraft-patch-SLE12-SP3_Update_8 | 1-4.3.5 | SUSE-SU-2018:0383-1 |
| SLE Live Patching 12 | kgraft-patch-SLE12-SP2_Update_18 | 1-3.3.2 | SUSE-SU-2018:0416-1 |
| SUSE OpenStack Cloud 6 | kernel-xen +3 | 3.12.74-60.64.85.1 | SUSE-SU-2018:0848-1 |
| SUSE OpenStack Cloud 6 | kgraft-patch-SLE12-SP1_Update_26 | 1-2.3.1 | SUSE-SU-2018:0848-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | kernel-ec2 +6 | 3.0.101-0.47.106.19.1 | SUSE-SU-2018:0660-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | dtrace-modules-3.8.13-118.26.1.el6uek +1 | 0.4.5-3.el6 | ELSA-2019-4316, ELSA-2018-4268 |
| Oracle Linux 7 | dtrace-modules-3.8.13-118.26.1.el7uek +1 | 0.4.5-3.el7 | ELSA-2019-4316, ELSA-2018-4268 |
| Oracle Linux 7 | kernel-uek +5 | 3.8.13-118.26.1.el7uek | ELSA-2019-4316, ELSA-2018-4268, ELSA-2018-4161 |
| Oracle Linux 7 | perf +11 | 3.10.0-862.el7 | ELSA-2018-1062 |
Advisories 25
- RHSA-2018:1737 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2018:1170 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2018:1130 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2018:1062 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2018:0676 Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2018:1319 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- USN-3583-1 linux vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4187-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1369-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2018:0834-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0555-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0841-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0986-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0660-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0482-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0383-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0416-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2022-0532 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 11, 2025
- WID-SEC-2023-0526 Linux Kernel: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Sep 11, 2025
- SUSE-SU-2018:0848-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2023-0531 IBM SAN Volume Controller: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 28, 2023
- ELSA-2019-4316 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 4, 2019
- ELSA-2018-4268 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 8, 2018
- ELSA-2018-4161 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jul 10, 2018
- ELSA-2018-1062 Important: kernel security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Apr 16, 2018
References
- DSA-4187 vendor-advisory
- USN-3583-2 vendor-advisory
- http://patchwork.ozlabs.org/patch/746618/
- RHSA-2018:1737 vendor-advisory
- https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.36
- https://lkml.org/lkml/2017/4/2/13
- RHSA-2018:1062 vendor-advisory
- RHSA-2018:1319 vendor-advisory
- https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+Expert+v7.6.0
- USN-3583-1 vendor-advisory
- RHSA-2018:0676 vendor-advisory
- https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1739765
- https://github.com/torvalds/linux/commit/2638fd0f92d4397884fd991d8f4925cb3f081901
- RHSA-2018:1170 vendor-advisory
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2638fd0f92d4397884fd991d8f4925cb3f081901
- RHSA-2018:1130 vendor-advisory
- [debian-lts-announce] 20180502 [SECURITY] [DLA 1369-1] linux security update mailing-list
- 102367 vdb-entry
- SUSE-SU-2018:0834 vendor-advisory
- SUSE-SU-2018:0848 vendor-advisory
- SUSE-SU-2018:0383 vendor-advisory
- USN-3583-1 vendor-advisory
- https://support.f5.com/csp/article/K18352029
- SUSE-SU-2018:0555 vendor-advisory
- openSUSE-SU-2018:0408 vendor-advisory
- SUSE-SU-2018:0986 vendor-advisory
- SUSE-SU-2018:0416 vendor-advisory
- SUSE-SU-2018:0482 vendor-advisory
- SUSE-SU-2018:0841 vendor-advisory
- USN-3583-2 vendor-advisory
- SUSE-SU-2018:0660 vendor-advisory
- https://www.arista.com/en/support/advisories-notices/security-advisories/4577-security-advisory-34