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OpenAdvisories
High · 7.8 CVE-2025-40173 EUVD-2025-124910GHSA-hr9g-hq4q-3hfj

net/ip6_tunnel: Prevent perpetual tunnel growth

Published Nov 12, 2025 · Updated Oct 15, 2026 · Assigned by Linux

Vendor: Linux Product: Linux Package: kernel Package: linux Package: linux Package: linux-allwinner-5.19 Package: linux-aws Package: linux-aws-5.0 Package: linux-aws-5.11 Package: linux-aws-5.13 Package: linux-aws-5.15 Package: linux-aws-5.19 Package: linux-aws-5.3 Package: linux-aws-5.4 Package: linux-aws-5.8 Package: linux-aws-6.14 Package: linux-aws-6.17 Package: linux-aws-6.2 Package: linux-aws-6.5 Package: linux-aws-6.8 Package: linux-aws-fips Package: linux-aws-hwe Package: linux-azure Package: linux-azure-4.15 Package: linux-azure-5.11 Package: linux-azure-5.13 Package: linux-azure-5.15 Package: linux-azure-5.19 Package: linux-azure-5.3 Package: linux-azure-5.4 Package: linux-azure-5.8 Package: linux-azure-6.11 Package: linux-azure-6.14 Package: linux-azure-6.2 Package: linux-azure-6.5 Package: linux-azure-6.8 Package: linux-azure-edge Package: linux-azure-fde Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.14 Package: linux-azure-fde-6.2 Package: linux-azure-fde-6.8 Package: linux-azure-fips Package: linux-azure-nvidia Package: linux-azure-nvidia-6.14 Package: linux-bluefield Package: linux-fips Package: linux-gcp Package: linux-gcp-4.15 Package: linux-gcp-5.11 Package: linux-gcp-5.13 Package: linux-gcp-5.15 Package: linux-gcp-5.19 Package: linux-gcp-5.3 Package: linux-gcp-5.4 Package: linux-gcp-5.8 Package: linux-gcp-6.11 Package: linux-gcp-6.14 Package: linux-gcp-6.17 Package: linux-gcp-6.2 Package: linux-gcp-6.5 Package: linux-gcp-6.8 Package: linux-gcp-fips Package: linux-gke Package: linux-gke-4.15 Package: linux-gke-5.15 Package: linux-gke-5.4 Package: linux-gkeop Package: linux-gkeop-5.15 Package: linux-gkeop-5.4 Package: linux-hwe Package: linux-hwe-5.11 Package: linux-hwe-5.13 Package: linux-hwe-5.15 Package: linux-hwe-5.19 Package: linux-hwe-5.4 Package: linux-hwe-5.8 Package: linux-hwe-6.11 Package: linux-hwe-6.14 Package: linux-hwe-6.2 Package: linux-hwe-6.5 Package: linux-hwe-6.8 Package: linux-hwe-edge Package: linux-ibm Package: linux-ibm-5.15 Package: linux-ibm-5.4 Package: linux-ibm-6.8 Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-intel-iotg Package: linux-intel-iotg-5.15 Package: linux-iot Package: linux-kvm Package: linux-lowlatency Package: linux-lowlatency-hwe-5.15 Package: linux-lowlatency-hwe-5.19 Package: linux-lowlatency-hwe-6.11 Package: linux-lowlatency-hwe-6.2 Package: linux-lowlatency-hwe-6.5 Package: linux-lowlatency-hwe-6.8 Package: linux-nvidia Package: linux-nvidia-6.11 Package: linux-nvidia-6.17 Package: linux-nvidia-6.2 Package: linux-nvidia-6.5 Package: linux-nvidia-6.8 Package: linux-nvidia-lowlatency Package: linux-nvidia-tegra Package: linux-nvidia-tegra-5.15 Package: linux-nvidia-tegra-igx Package: linux-oem Package: linux-oem-5.10 Package: linux-oem-5.13 Package: linux-oem-5.14 Package: linux-oem-5.17 Package: linux-oem-5.6 Package: linux-oem-6.0 Package: linux-oem-6.1 Package: linux-oem-6.11 Package: linux-oem-6.14 Package: linux-oem-6.17 Package: linux-oem-6.5 Package: linux-oem-6.8 Package: linux-oracle Package: linux-oracle-5.0 Package: linux-oracle-5.11 Package: linux-oracle-5.13 Package: linux-oracle-5.15 Package: linux-oracle-5.3 Package: linux-oracle-5.4 Package: linux-oracle-5.8 Package: linux-oracle-6.14 Package: linux-oracle-6.17 Package: linux-oracle-6.5 Package: linux-oracle-6.8 Package: linux-raspi Package: linux-raspi-5.4 Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-realtime Package: linux-realtime-6.14 Package: linux-realtime-6.17 Package: linux-realtime-6.8 Package: linux-riscv Package: linux-riscv-5.11 Package: linux-riscv-5.15 Package: linux-riscv-5.19 Package: linux-riscv-5.8 Package: linux-riscv-6.14 Package: linux-riscv-6.5 Package: linux-riscv-6.8 Package: linux-starfive-5.19 Package: linux-starfive-6.2 Package: linux-starfive-6.5 Package: linux-vmware Package: linux-xilinx Package: linux-xilinx-zynqmp Platform: Linux Ecosystem: Azure Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

In the Linux kernel, the following vulnerability has been resolved:

net/ip6_tunnel: Prevent perpetual tunnel growth

Similarly to ipv4 tunnel, ipv6 version updates dev->needed_headroom, too.
While ipv4 tunnel headroom adjustment growth was limited in
commit 5ae1e9922bbd ("net: ip_tunnel: prevent perpetual headroom growth"),
ipv6 tunnel yet increases the headroom without any ceiling.

Reflect ipv4 tunnel headroom adjustment limit on ipv6 version.

Credits to Francesco Ruggeri, who was originally debugging this issue
and wrote local Arista-specific patch and a reproducer.

Affected products

VendorProductAffectedFixed
Linux Linux 4.7 5.4.301

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 6.17.6-1 —
Debian 13 linux 6.12.57-1 —
Debian 12 linux 6.1.158-1 —
Debian 11 linux 5.10.247-1 DLA-4404-1
Debian 11 linux-6.1 6.1.158-1~deb11u1 DLA-4379-1
ReleasePackageFixed inAdvisory
Ubuntu Nvidia-BlueField 24.04 LTS linux-bluefield 6.8.0-1017.21 —
Ubuntu Nvidia-BlueField 22.04 LTS linux-bluefield 5.15.0-1084.86 —
Ubuntu 25.10 linux 6.17.0-14.14 USN-8029-1
Ubuntu 25.10 linux-aws +2 6.17.0-1007.7 USN-8030-1, USN-8029-2
Ubuntu 25.10 linux-azure +1 6.17.0-1008.8 USN-8029-3, USN-8029-1
Ubuntu 25.10 linux-azure-fde No fix yet —
Ubuntu 25.10 linux-realtime 6.17.0-1006.7 USN-8029-1
Ubuntu 25.10 linux-riscv 6.17.0-14.14.1 —
Ubuntu 24.04 LTS linux 6.8.0-106.106 USN-8095-1
Ubuntu 24.04 LTS linux-aws 6.8.0-1050.53 USN-8095-1
Ubuntu 24.04 LTS linux-aws-6.17 +1 6.17.0-1007.7~24.04.1 —
Ubuntu 24.04 LTS linux-azure 6.8.0-1051.57 USN-8125-1
Ubuntu 24.04 LTS linux-azure-fde 6.8.0-1058.65 —
Ubuntu 24.04 LTS linux-azure-nvidia 6.8.0-1039.42 —
Ubuntu 24.04 LTS linux-gcp 6.8.0-1052.55 USN-8095-1
Ubuntu 24.04 LTS linux-gcp-6.17 6.17.0-1008.8~24.04.1 —
Ubuntu 24.04 LTS linux-gke 6.8.0-1048.53 USN-8095-1
Ubuntu 24.04 LTS linux-gkeop 6.8.0-1035.38 USN-8095-1
Ubuntu 24.04 LTS linux-ibm 6.8.0-1049.49 USN-8095-1
Ubuntu 24.04 LTS linux-lowlatency 6.8.0-106.106.1 USN-8095-1
Ubuntu 24.04 LTS linux-nvidia 6.8.0-1049.52 USN-8100-1
Ubuntu 24.04 LTS linux-nvidia-6.17 6.17.0-1008.8 —
Ubuntu 24.04 LTS linux-nvidia-lowlatency 6.8.0-1049.52.1 USN-8100-1
Ubuntu 24.04 LTS linux-nvidia-tegra 6.8.0-1020.20 —
Ubuntu 24.04 LTS linux-oem-6.17 6.17.0-1011.11 USN-8048-1
Ubuntu 24.04 LTS linux-oracle 6.8.0-1047.48 USN-8095-1
Ubuntu 24.04 LTS linux-raspi 6.8.0-1050.54 USN-8095-5
Ubuntu 24.04 LTS linux-riscv +18 No fix yet —
Ubuntu 24.04 LTS linux-xilinx 6.8.0-1028.29 USN-8261-1
Ubuntu 22.04 LTS linux +1 5.15.0-170.180 USN-8033-1
Ubuntu 22.04 LTS linux-aws 5.15.0-1100.107 USN-8033-1
Ubuntu 22.04 LTS linux-aws-6.8 6.8.0-1050.53~22.04.1 USN-8095-4
Ubuntu 22.04 LTS linux-azure 5.15.0-1109.118 USN-8163-2
Ubuntu 22.04 LTS linux-azure-6.8 6.8.0-1051.57~22.04.1 USN-8126-1
Ubuntu 22.04 LTS linux-azure-fde 5.15.0-1109.118.1 —
Ubuntu 22.04 LTS linux-azure-fde-6.8 6.8.0-1058.65~22.04.1 —
Ubuntu 22.04 LTS linux-gcp 5.15.0-1100.109 USN-8033-1
Ubuntu 22.04 LTS linux-gcp-6.8 6.8.0-1052.55~22.04.1 USN-8095-1
Ubuntu 22.04 LTS linux-gke 5.15.0-1096.102 USN-8033-1
Ubuntu 22.04 LTS linux-gkeop 5.15.0-1083.91 USN-8033-1
Ubuntu 22.04 LTS linux-hwe-6.8 +1 6.8.0-106.106~22.04.1 USN-8095-1
Ubuntu 22.04 LTS linux-ibm 5.15.0-1094.97 USN-8033-1
Ubuntu 22.04 LTS linux-ibm-6.8 6.8.0-1049.49~22.04.1 USN-8095-1
Ubuntu 22.04 LTS linux-intel-iotg 5.15.0-1095.101 USN-8033-8
Ubuntu 22.04 LTS linux-kvm 5.15.0-1092.97 USN-8033-5
Ubuntu 22.04 LTS linux-lowlatency-hwe-6.8 6.8.0-106.106.1~22.04.1 USN-8095-1
Ubuntu 22.04 LTS linux-nvidia 5.15.0-1095.96 USN-8033-6
Ubuntu 22.04 LTS linux-nvidia-6.8 6.8.0-1049.52~22.04.1 USN-8100-1
Ubuntu 22.04 LTS linux-nvidia-tegra 5.15.0-1052.52 USN-8034-1
Ubuntu 22.04 LTS linux-nvidia-tegra-igx 5.15.0-1041.41 USN-8034-2
Ubuntu 22.04 LTS linux-oracle 5.15.0-1097.103 USN-8033-5
Ubuntu 22.04 LTS linux-oracle-6.8 6.8.0-1047.48~22.04.1 USN-8095-1
Ubuntu 22.04 LTS linux-raspi 5.15.0-1097.100 USN-8141-1
Ubuntu 22.04 LTS linux-riscv +32 No fix yet —
Ubuntu 22.04 LTS linux-xilinx-zynqmp 5.15.0-1064.68 USN-8033-7
Show 16 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 20.04 LTS linux-gke +28 No fix yet —
Ubuntu 18.04 LTS linux-gcp +14 No fix yet —
Ubuntu 16.04 LTS linux-hwe-edge No fix yet —
Ubuntu Pro Realtime 24.04 LTS linux-raspi-realtime 6.8.0-2040.41 USN-8095-5
Ubuntu Pro Realtime 24.04 LTS linux-realtime 6.8.1-1045.46 USN-8095-3
Ubuntu Pro Realtime 24.04 LTS linux-realtime-6.14 No fix yet —
Ubuntu Pro Realtime 24.04 LTS linux-realtime-6.17 6.17.0-1006.7~24.04.1 —
Ubuntu Pro Realtime 22.04 LTS linux-intel-iot-realtime 5.15.0-1092.94 USN-8033-2
Ubuntu Pro Realtime 22.04 LTS linux-realtime 5.15.0-1099.108 USN-8033-2
Ubuntu Pro Realtime 22.04 LTS linux-realtime-6.8 6.8.1-1045.46~22.04.1 USN-8095-3
Ubuntu Pro FIPS 20.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS 18.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 24.04 LTS linux-aws-fips 6.8.0-1050.53+fips1 USN-8095-2
Ubuntu Pro FIPS-updates 24.04 LTS linux-azure-fips 6.8.0-1052.58+fips1 USN-8165-1
Ubuntu Pro FIPS-updates 24.04 LTS linux-fips 6.8.0-106.106+fips1 USN-8095-2
Ubuntu Pro FIPS-updates 24.04 LTS linux-gcp-fips 6.8.0-1052.55+fips1 USN-8095-2
Ubuntu Pro FIPS-updates 22.04 LTS linux-aws-fips 5.15.0-1100.107+fips1 USN-8033-3
Ubuntu Pro FIPS-updates 22.04 LTS linux-azure-fips 5.15.0-1109.118+fips1 USN-8163-1
Ubuntu Pro FIPS-updates 22.04 LTS linux-fips 5.15.0-170.180+fips1 USN-8033-3
Ubuntu Pro FIPS-updates 22.04 LTS linux-gcp-fips 5.15.0-1100.109+fips1 USN-8033-3
Ubuntu Pro FIPS-updates 20.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 18.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-preview 22.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro 20.04 LTS linux +10 No fix yet —
Ubuntu Pro 20.04 LTS linux-aws-5.15 5.15.0-1100.107~20.04.2 USN-8033-4
Ubuntu Pro 20.04 LTS linux-azure-5.15 5.15.0-1110.119~20.04.1 USN-8243-1
Ubuntu Pro 20.04 LTS linux-gcp-5.15 5.15.0-1100.109~20.04.1 USN-8033-5
Ubuntu Pro 20.04 LTS linux-hwe-5.15 5.15.0-170.180~20.04.3 USN-8033-1
Ubuntu Pro 20.04 LTS linux-ibm-5.15 5.15.0-1094.97~20.04.1 USN-8033-1
Ubuntu Pro 20.04 LTS linux-intel-iotg-5.15 5.15.0-1095.101~20.04.1 USN-8033-7
Ubuntu Pro 20.04 LTS linux-lowlatency-hwe-5.15 5.15.0-170.180~20.04.1 USN-8033-1
Ubuntu Pro 20.04 LTS linux-nvidia-tegra-5.15 5.15.0-1052.52~20.04.2 USN-8034-1
Ubuntu Pro 20.04 LTS linux-oracle-5.15 5.15.0-1097.103~20.04.1 USN-8033-5
Ubuntu Pro 20.04 LTS linux-riscv-5.15 5.15.0-1095.99~20.04.1 —
Ubuntu Pro 18.04 LTS linux +12 No fix yet —
Ubuntu Pro 16.04 LTS linux-gcp +4 No fix yet —
Ubuntu Pro 14.04 LTS linux-azure No fix yet —
ReleasePackageFixed inAdvisory
SLES 15 SP7 kernel-64kb +5 6.4.0-150700.53.25.1 SUSE-SU-2025:4393-1
SLES 15 SP7 kernel-azure +2 6.4.0-150700.20.21.1 SUSE-SU-2025:4517-1
SLES 15 SP7 kernel-default-base 6.4.0-150700.53.25.1.150700.17.17.1 SUSE-SU-2025:4393-1
SLES 15 SP7 kernel-docs 6.4.0-150700.53.25.2 SUSE-SU-2025:4393-1
SLES 15 SP6 kernel-64kb +3 6.4.0-150600.23.81.3 SUSE-SU-2025:4422-1
SLES 15 SP6 kernel-azure +2 6.4.0-150600.8.58.1 SUSE-SU-2025:4505-1
SLES 15 SP6 kernel-default-base 6.4.0-150600.23.81.3.150600.12.36.3 SUSE-SU-2025:4422-1
SLES 15 SP6 kernel-docs +1 6.4.0-150600.23.81.1 SUSE-SU-2025:4422-1
SLES 15 SP6 kernel-source 6.4.0-150600.23.81.2 SUSE-SU-2025:4422-1
SLES 12 SP5 kernel-syms +2 4.12.14-122.283.1 SUSE-SU-2025:4515-1
Show 10 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLES for SAP 16.0 kernel-64kb +7 6.12.0-160000.8.1 SUSE-SU-2026:20015-1
SLES for SAP 16.0 kernel-default-base 6.12.0-160000.8.1.160000.2.5 SUSE-SU-2026:20015-1
SLES 16.0 kernel-64kb +7 6.12.0-160000.8.1 SUSE-SU-2026:20021-1, SUSE-SU-2026:20015-1
SLES 16.0 kernel-default-base 6.12.0-160000.8.1.160000.2.5 SUSE-SU-2026:20015-1
SLE Micro 6.2 kernel-default-base 6.12.0-160000.8.1.160000.2.5 SUSE-SU-2026:20012-1
SLE Micro 6.2 kernel-rt +5 6.12.0-160000.8.1 SUSE-SU-2026:20562-1, SUSE-SU-2026:20012-1
SLE Micro 6.1 kernel-default-base 6.4.0-38.1.21.15 SUSE-SU-2026:20496-1
SLE Micro 6.1 kernel-rt +1 6.4.0-39.1 SUSE-SU-2026:20059-1
SLE Micro 6.1 kernel-source +2 6.4.0-38.1 SUSE-SU-2026:20496-1
SLE Micro 6.0 kernel-default-base 6.4.0-38.1.21.15 SUSE-SU-2026:20473-1
SLE Micro 6.0 kernel-rt +1 6.4.0-39.1 SUSE-SU-2026:20039-1
SLE Micro 6.0 kernel-source +2 6.4.0-38.1 SUSE-SU-2026:20473-1
SLE Live Patching 15 SP7 kernel-default 6.4.0-150700.53.25.1 SUSE-SU-2025:4393-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7-RT_Update_7 1-150700.1.3.1 SUSE-SU-2025:4516-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7_Update_7 1-150700.15.3.1 SUSE-SU-2025:4393-1
SLE Live Patching 15 SP6 kernel-default 6.4.0-150600.23.81.3 SUSE-SU-2025:4422-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6-RT_Update_18 1-150600.1.3.1 SUSE-SU-2025:4521-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_18 1-150600.13.3.3 SUSE-SU-2025:4422-1
SLE Live Patching 12 SP5 kernel-default 4.12.14-122.283.1 SUSE-SU-2025:4515-1
SLE Live Patching 12 SP5 kgraft-patch-SLE12-SP5_Update_75 1-8.3.1 SUSE-SU-2025:4515-1
SUSE Real Time Module 15 SP7 kernel-rt +2 6.4.0-150700.7.25.1 SUSE-SU-2025:4516-1
SUSE Real Time Module 15 SP6 kernel-rt +3 6.4.0-150600.10.61.1 SUSE-SU-2025:4521-1
ReleasePackageFixed inAdvisory
openSUSE Leap 16.0 kernel-default-base 6.12.0-160000.8.1.160000.2.5 openSUSE-SU-2025:20172-1
openSUSE Leap 16.0 kernel-rt +10 6.12.0-160000.8.1 openSUSE-SU-2025:20172-1
openSUSE Leap 15.6 dtb-aarch64 +3 6.4.0-150600.23.81.1 SUSE-SU-2025:4422-1
openSUSE Leap 15.6 kernel-64kb +5 6.4.0-150600.23.81.3 SUSE-SU-2025:4422-1
openSUSE Leap 15.6 kernel-azure +2 6.4.0-150600.8.58.1 SUSE-SU-2025:4505-1
openSUSE Leap 15.6 kernel-default-base 6.4.0-150600.23.81.3.150600.12.36.3 SUSE-SU-2025:4422-1
openSUSE Leap 15.6 kernel-rt +3 6.4.0-150600.10.61.1 SUSE-SU-2025:4521-1
openSUSE Leap 15.6 kernel-source 6.4.0-150600.23.81.2 SUSE-SU-2025:4422-1

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2023 kernel-livepatch-6.12.55-74.119 +1 1:1.0-0.amzn2023 ALAS2023-2025-1316, ALAS2023-2025-1297
Amazon Linux 2023 perf +14 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297
Amazon Linux 2023 perf6.12 +14 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316
Amazon Linux 2 kernel-livepatch-4.14.355-280.713 1.0-0.amzn2 ALAS2-2026-3161
Amazon Linux 2 perf +8 4.14.355-280.713.amzn2 ALAS2-2026-3161

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 kernel 6.6.117.1-1 —

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 8 bpftool +18 5.15.0-315.196.5.1.el9uek ELSA-2025-28048
Oracle Linux 7 kernel-uek +6 5.4.17-2136.350.3.1.el8uek ELSA-2025-28049
Oracle Linux 7 kernel-uek-tools 5.4.17-2136.350.3.1.el7uek ELSA-2025-28049

Advisories 50

References