CVE-2025-40173

net/ip6_tunnel: Prevent perpetual tunnel growth

CVE-2025-40173 is fixed in 87 products on 1 platform, first by DEBIAN-CVE-2025-40173, released November 12, 2025. It is not reported as exploited. Patch Radar priority: High.

High
CVSS
7.8
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0015
4th percentile

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.

Where it's fixed

ProductFixed inFixReleased
Linux
bpftool · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
bpftool · ol 8 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
bpftool · ol 9 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
bpftool-debuginfo · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
bpftool6.12 · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
bpftool6.12-debuginfo · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
dtb-aarch64 · opensuse-leap 15.6 6.4.0-150600.23.81.1 SUSE-SU-2025:4422-1 Dec 17, 2025
dtb-aarch64 · opensuse-leap 16.0 6.12.0-160000.8.1 OPENSUSE-SU-2025:20172-1 Dec 19, 2025
kernel · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
kernel-64kb · opensuse-leap 15.6 6.4.0-150600.23.81.3 SUSE-SU-2025:4422-1 Dec 17, 2025
kernel-64kb · opensuse-leap 16.0 6.12.0-160000.8.1 OPENSUSE-SU-2025:20172-1 Dec 19, 2025
kernel-64kb · sles 15.6 6.4.0-150600.23.81.3 SUSE-SU-2025:4422-1 Dec 17, 2025
kernel-64kb · sles 15.7 6.4.0-150700.53.25.1 SUSE-SU-2025:4393-1 Dec 15, 2025
kernel-64kb · sles 16.0 6.12.0-160000.8.1 SUSE-SU-2026:20015-1 Dec 19, 2025
kernel-azure · opensuse-leap 15.6 6.4.0-150600.8.58.1 SUSE-SU-2025:4505-1 Dec 22, 2025
kernel-azure · sles 15.6 6.4.0-150600.8.58.1 SUSE-SU-2025:4505-1 Dec 22, 2025
kernel-azure · sles 15.7 6.4.0-150700.20.21.1 SUSE-SU-2025:4517-1 Dec 23, 2025
kernel-debug · opensuse-leap 15.6 6.4.0-150600.23.81.3 SUSE-SU-2025:4422-1 Dec 17, 2025
kernel-debuginfo · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
kernel-debuginfo-common-aarch64 · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
kernel-debuginfo-common-x86_64 · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
kernel-default · opensuse-leap 15.6 6.4.0-150600.23.81.3 SUSE-SU-2025:4422-1 Dec 17, 2025
kernel-default · opensuse-leap 16.0 6.12.0-160000.8.1 OPENSUSE-SU-2025:20172-1 Dec 19, 2025
kernel-default · sles 15.6 6.4.0-150600.23.81.3 SUSE-SU-2025:4422-1 Dec 17, 2025
kernel-default · sles 15.7 6.4.0-150700.53.25.1 SUSE-SU-2025:4393-1 Dec 15, 2025
kernel-default · sles 16.0 6.12.0-160000.8.1 SUSE-SU-2026:20015-1 Dec 19, 2025
kernel-default-base · opensuse-leap 15.6 6.4.0-150600.23.81.3.150600.12.36.3 SUSE-SU-2025:4422-1 Dec 17, 2025
kernel-default-base · opensuse-leap 16.0 6.12.0-160000.8.1.160000.2.5 OPENSUSE-SU-2025:20172-1 Dec 19, 2025
kernel-default-base · sles 15.6 6.4.0-150600.23.81.3.150600.12.36.3 SUSE-SU-2025:4422-1 Dec 17, 2025
kernel-default-base · sles 15.7 6.4.0-150700.53.25.1.150700.17.17.1 SUSE-SU-2025:4393-1 Dec 15, 2025
kernel-default-base · sles 16.0 6.12.0-160000.8.1.160000.2.5 SUSE-SU-2026:20015-1 Dec 19, 2025
kernel-devel · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
kernel-docs · opensuse-leap 15.6 6.4.0-150600.23.81.1 SUSE-SU-2025:4422-1 Dec 17, 2025
kernel-docs · opensuse-leap 16.0 6.12.0-160000.8.1 OPENSUSE-SU-2025:20172-1 Dec 19, 2025
kernel-docs · sles 15.6 6.4.0-150600.23.81.1 SUSE-SU-2025:4422-1 Dec 17, 2025
kernel-docs · sles 15.7 6.4.0-150700.53.25.2 SUSE-SU-2025:4393-1 Dec 15, 2025
kernel-docs · sles 16.0 6.12.0-160000.8.1 SUSE-SU-2026:20015-1 Dec 19, 2025
kernel-headers · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
kernel-kvmsmall · opensuse-leap 15.6 6.4.0-150600.23.81.3 SUSE-SU-2025:4422-1 Dec 17, 2025
kernel-kvmsmall · opensuse-leap 16.0 6.12.0-160000.8.1 OPENSUSE-SU-2025:20172-1 Dec 19, 2025
kernel-kvmsmall · sles 16.0 6.12.0-160000.8.1 SUSE-SU-2026:20015-1 Dec 19, 2025
kernel-libbpf · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
kernel-libbpf-debuginfo · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
kernel-libbpf-devel · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
kernel-libbpf-static · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
kernel-livepatch-6.1.158-178.288 · amzn 2023 1:1.0-0.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
kernel-livepatch-6.12.55-74.119 · amzn 2023 1:1.0-0.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
kernel-livepatch-SLE15-SP6-RT_Update_18 · sles 15.6 1-150600.1.3.1 SUSE-SU-2025:4521-1 Dec 24, 2025
kernel-livepatch-SLE15-SP6_Update_18 · sles 15.6 1-150600.13.3.3 SUSE-SU-2025:4422-1 Dec 17, 2025
kernel-livepatch-SLE15-SP7-RT_Update_7 · sles 15.7 1-150700.1.3.1 SUSE-SU-2025:4516-1 Dec 23, 2025
kernel-livepatch-SLE15-SP7_Update_7 · sles 15.7 1-150700.15.3.1 SUSE-SU-2025:4393-1 Dec 15, 2025
kernel-modules-extra · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
kernel-modules-extra-common · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
kernel-obs-build · opensuse-leap 15.6 6.4.0-150600.23.81.3 SUSE-SU-2025:4422-1 Dec 17, 2025
kernel-obs-build · opensuse-leap 16.0 6.12.0-160000.8.1 OPENSUSE-SU-2025:20172-1 Dec 19, 2025
kernel-obs-build · sles 15.6 6.4.0-150600.23.81.3 SUSE-SU-2025:4422-1 Dec 17, 2025
kernel-obs-build · sles 15.7 6.4.0-150700.53.25.1 SUSE-SU-2025:4393-1 Dec 15, 2025
kernel-obs-qa · opensuse-leap 15.6 6.4.0-150600.23.81.1 SUSE-SU-2025:4422-1 Dec 17, 2025
kernel-obs-qa · opensuse-leap 16.0 6.12.0-160000.8.1 OPENSUSE-SU-2025:20172-1 Dec 19, 2025
kernel-obs-qa · sles 16.0 6.12.0-160000.8.1 SUSE-SU-2026:20015-1 Dec 19, 2025
kernel-rt · opensuse-leap 15.6 6.4.0-150600.10.61.1 SUSE-SU-2025:4521-1 Dec 24, 2025
kernel-rt · opensuse-leap 16.0 6.12.0-160000.8.1 OPENSUSE-SU-2025:20172-1 Dec 19, 2025
kernel-rt_debug · opensuse-leap 15.6 6.4.0-150600.10.61.1 SUSE-SU-2025:4521-1 Dec 24, 2025
kernel-source · opensuse-leap 15.6 6.4.0-150600.23.81.2 SUSE-SU-2025:4422-1 Dec 17, 2025
kernel-source · opensuse-leap 16.0 6.12.0-160000.8.1 OPENSUSE-SU-2025:20172-1 Dec 19, 2025
kernel-source · sles 15.6 6.4.0-150600.23.81.2 SUSE-SU-2025:4422-1 Dec 17, 2025
kernel-source · sles 15.7 6.4.0-150700.53.25.1 SUSE-SU-2025:4393-1 Dec 15, 2025
kernel-source · sles 16.0 6.12.0-160000.8.1 SUSE-SU-2026:20015-1 Dec 19, 2025
kernel-source-azure · opensuse-leap 15.6 6.4.0-150600.8.58.1 SUSE-SU-2025:4505-1 Dec 22, 2025
kernel-source-azure · sles 15.6 6.4.0-150600.8.58.1 SUSE-SU-2025:4505-1 Dec 22, 2025
kernel-source-azure · sles 15.7 6.4.0-150700.20.21.1 SUSE-SU-2025:4517-1 Dec 23, 2025
kernel-source-rt · opensuse-leap 15.6 6.4.0-150600.10.61.1 SUSE-SU-2025:4521-1 Dec 24, 2025
kernel-syms · opensuse-leap 15.6 6.4.0-150600.23.81.1 SUSE-SU-2025:4422-1 Dec 17, 2025
kernel-syms · opensuse-leap 16.0 6.12.0-160000.8.1 OPENSUSE-SU-2025:20172-1 Dec 19, 2025
kernel-syms · sles 15.6 6.4.0-150600.23.81.1 SUSE-SU-2025:4422-1 Dec 17, 2025
kernel-syms · sles 15.7 6.4.0-150700.53.25.1 SUSE-SU-2025:4393-1 Dec 15, 2025
kernel-syms · sles 16.0 6.12.0-160000.8.1 SUSE-SU-2026:20015-1 Dec 19, 2025
kernel-syms-azure · opensuse-leap 15.6 6.4.0-150600.8.58.1 SUSE-SU-2025:4505-1 Dec 22, 2025
kernel-syms-azure · sles 15.6 6.4.0-150600.8.58.1 SUSE-SU-2025:4505-1 Dec 22, 2025
kernel-syms-azure · sles 15.7 6.4.0-150700.20.21.1 SUSE-SU-2025:4517-1 Dec 23, 2025
kernel-syms-rt · opensuse-leap 15.6 6.4.0-150600.10.61.1 SUSE-SU-2025:4521-1 Dec 24, 2025
kernel-tools · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
kernel-tools-debuginfo · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
kernel-tools-devel · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
kernel-uek · ol 8 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek · ol 9 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-container · ol 8 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-container · ol 9 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-container-debug · ol 8 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-container-debug · ol 9 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-core · ol 8 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-core · ol 9 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-debug · ol 8 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-debug · ol 9 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-debug-core · ol 8 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-debug-core · ol 9 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-debug-devel · ol 8 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-debug-devel · ol 9 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-debug-modules · ol 8 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-debug-modules · ol 9 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-debug-modules-extra · ol 8 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-debug-modules-extra · ol 9 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-devel · ol 8 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-devel · ol 9 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-doc · ol 8 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-doc · ol 9 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-modules · ol 8 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-modules · ol 9 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-modules-extra · ol 8 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-modules-extra · ol 9 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek-tools · ol 8 0:5.4.17-2136.350.3.1.el7uek ELSA-2025-28049 Dec 12, 2025
kernel-uek64k · ol 8 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek64k · ol 9 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek64k-core · ol 8 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek64k-core · ol 9 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek64k-devel · ol 8 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek64k-devel · ol 9 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek64k-modules · ol 8 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek64k-modules · ol 9 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek64k-modules-extra · ol 8 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-uek64k-modules-extra · ol 9 0:5.15.0-315.196.5.1.el9uek ELSA-2025-28048 Dec 12, 2025
kernel-zfcpdump · opensuse-leap 15.6 6.4.0-150600.23.81.3 SUSE-SU-2025:4422-1 Dec 17, 2025
kernel-zfcpdump · opensuse-leap 16.0 6.12.0-160000.8.1 OPENSUSE-SU-2025:20172-1 Dec 19, 2025
kernel-zfcpdump · sles 15.6 6.4.0-150600.23.81.3 SUSE-SU-2025:4422-1 Dec 17, 2025
kernel-zfcpdump · sles 15.7 6.4.0-150700.53.25.1 SUSE-SU-2025:4393-1 Dec 15, 2025
kernel-zfcpdump · sles 16.0 6.12.0-160000.8.1 SUSE-SU-2026:20015-1 Dec 19, 2025
kernel6.12 · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
kernel6.12-debuginfo · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
kernel6.12-debuginfo-common-aarch64 · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
kernel6.12-debuginfo-common-x86_64 · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
kernel6.12-devel · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
kernel6.12-headers · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
kernel6.12-libbpf · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
kernel6.12-libbpf-debuginfo · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
kernel6.12-libbpf-devel · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
kernel6.12-libbpf-static · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
kernel6.12-modules-extra · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
kernel6.12-modules-extra-common · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
kernel6.12-tools · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
kernel6.12-tools-debuginfo · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
kernel6.12-tools-devel · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
linux · Debian 12.15 (bookworm) 6.1.158-1 DEBIAN-CVE-2025-40173 Nov 12, 2025
linux · Debian 13.5 (trixie) 6.12.57-1 DEBIAN-CVE-2025-40173 Nov 12, 2025
linux · Debian 14 6.17.6-1 DEBIAN-CVE-2025-40173 Nov 12, 2025
perf · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
perf-debuginfo · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
perf6.12 · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
perf6.12-debuginfo · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
python3-perf · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
python3-perf-debuginfo · amzn 2023 1:6.1.158-178.288.amzn2023 ALAS2023-2025-1297 Dec 8, 2025
python3-perf6.12 · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025
python3-perf6.12-debuginfo · amzn 2023 1:6.12.55-74.119.amzn2023 ALAS2023-2025-1316 Dec 8, 2025

Patch Radar data is free to use with attribution. Terms and how to credit it.

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.