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net: ip6_tunnel: require CAP_NET_ADMIN in the device netns for changelink
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
Affected products
Linux
- <3.12
- <2496fa0b7d180b3ad356b514e7ff93bb14e6140a
- =<6.6.*
- <234cd54fc500f69db43e37de38603da617fbbeea
- <2636d061bc237a2446a146e42dcc6563acfa7432
- =<*
- <7f68f7928484f463a5bc0d50e6fdd8d16f55a5aa
- =<6.18.*
- =<6.12.*
- =<7.1.*
- ==3.12
- <d4bcc202a3530c856e1cb183384bc9cc8fddab22