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

net: ip6_gre: require CAP_NET_ADMIN in the device netns for changelink

ip6gre_changelink() and ip6erspan_changelink() operate 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 both ops on rtnl_dev_link_net_capable() at their top, before any
attribute is parsed.

https://git.kernel.org/stable/c/03d8843b143ebbbfaf48511922abc6e886575a61

https://git.kernel.org/stable/c/0caa9f348f8b5356900de77b0bb89a697c4aff20

https://git.kernel.org/stable/c/129f8939e5af683cec3a1a5edcb40a64636ad81e

https://git.kernel.org/stable/c/1d4d8ee002083ca4ead5353662bf8362428af57f

https://git.kernel.org/stable/c/220162c9fedbe992da70d70f50a10da4f45f914c

https://git.kernel.org/stable/c/c38c8b0db3c65b597e7ece317b6cb59de3d15e69

https://git.kernel.org/stable/c/e3724dedf57761c6de52f4d604ec74f66fd61611

https://git.kernel.org/stable/c/f00a50876d2818bd6dc86fa98b3ef360884c53c8

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