CVE-2026-72051

Description

In the Linux kernel, the following vulnerability has been resolved: net: ip6_tunnel: require CAP_NET_ADMIN in the device netns for changelink ip6_tnl_changelink() operates on at most two netns, dev_net(dev) and the tunnel link netns t->net. They differ once the device is created in or moved to a netns other than the one the request runs in. The rtnl changelink path checks CAP_NET_ADMIN only against dev_net(dev), so a caller privileged there but not in t->net can rewrite a tunnel that lives in t->net. Gate ip6_tnl_changelink() on rtnl_dev_link_net_capable() at its top, before any attribute is parsed.

References

• https://git.kernel.org/stable/c/234cd54fc500f69db43e37de38603da617fbbeea
• https://git.kernel.org/stable/c/2496fa0b7d180b3ad356b514e7ff93bb14e6140a
• https://git.kernel.org/stable/c/2636d061bc237a2446a146e42dcc6563acfa7432
• https://git.kernel.org/stable/c/7f68f7928484f463a5bc0d50e6fdd8d16f55a5aa
• https://git.kernel.org/stable/c/d4bcc202a3530c856e1cb183384bc9cc8fddab22