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

In the Linux kernel, the following vulnerability has been resolved: net: ip_vti: require CAP_NET_ADMIN in the device netns for changelink vti_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 vti_changelink() on rtnl_dev_link_net_capable() at its top, before any attribute is parsed.

Affected products

Linux
  • <1caf737e625143c6f23c32d2b747b1a3e42e5699
  • <33fd93961557ec8e3e9958995b28684c5f949394
  • =<5.10.*
  • <88b33ee458a6ca5fbef6c53b9dba772da69dab68
  • =<6.6.*
  • =<*
  • <32edf8aa297745226854eda2d96c0fac66c1bb15
  • ==3.15
  • <973ead9e565423642e4533e1547b5d2c0476fb03
  • <3.15
  • =<6.18.*
  • =<6.12.*
  • <6d8bc0dc99472d62c57c2a3d436e6ab408592bda
  • =<7.1.*
  • =<5.15.*
  • <9571af2eec8023af9a1671b7f2cd4ab400011724
  • =<6.1.*
  • <95cceadbfd52d7239bd730afdda0655287d77425