In the Linux kernel, the following vulnerability has been resolved:
xfrm: xfrm_interface: require CAP_NET_ADMIN in the device netns for changelink
xfrmi_changelink() operates on at most two netns, dev_net(dev) and the interface link netns xi->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 xi->net can rewrite an interface that lives in xi->net.
Gate xfrmi_changelink() on rtnl_dev_link_net_capable() at its top, before any attribute is parsed.
References
- https://git.kernel.org/stable/c/04c1aa57d08471b1953bf27c84ac9b3d78d71831
- https://git.kernel.org/stable/c/095515d89b19b6cc19dfcdc846f97403ed1ebce3
- https://git.kernel.org/stable/c/37b61946d278c7deb0d40ba8f2b6fc0478d61dab
- https://git.kernel.org/stable/c/3ba2b2ef7d6a63b190f15cfc2b4ba0fba59928ea
- https://git.kernel.org/stable/c/80ec68bba11f7f387c0e4099c2d7b2c84943eb99
- https://git.kernel.org/stable/c/8ca2a19a987a7d1cb4c916ed9723a1c6993b4276
- https://git.kernel.org/stable/c/bdfd1c21d90e628a58a9de79e024cdfcbedfa15c
- https://git.kernel.org/stable/c/e9c90756f10da334fb31552e52c61f1dba69f491