CVE-2025-40173

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net/ip6_tunnel: Prevent perpetual tunnel growth<br /> <br /> Similarly to ipv4 tunnel, ipv6 version updates dev-&gt;needed_headroom, too.<br /> While ipv4 tunnel headroom adjustment growth was limited in<br /> commit 5ae1e9922bbd ("net: ip_tunnel: prevent perpetual headroom growth"),<br /> ipv6 tunnel yet increases the headroom without any ceiling.<br /> <br /> Reflect ipv4 tunnel headroom adjustment limit on ipv6 version.<br /> <br /> Credits to Francesco Ruggeri, who was originally debugging this issue<br /> and wrote local Arista-specific patch and a reproducer.