CVE-2026-72053

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

net: ipip: require CAP_NET_ADMIN in the device netns for changelink

ipip_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 ipip_changelink() on rtnl_dev_link_net_capable() at its top,

before any attribute is parsed.