CVE-2026-72061

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

net: sit: require CAPNETADMIN in the device netns for changelink

ipip6changelink() operates on at most two netns, devnet(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 CAPNETADMIN 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 ipip6changelink() on rtnldevlinknet_capable() at its top, before any attribute is parsed. sit was the one tunnel type not covered by the recent series that added this check to the other changelink() handlers.