CVE-2026-72053

Description

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

References

• https://git.kernel.org/stable/c/26544021d5c49cc6ae8a968ccb5033e6363854a4
• https://git.kernel.org/stable/c/68cadc3698c7de88966d306d12ec9c6217da228a
• https://git.kernel.org/stable/c/8211a26324667980a463c069469a818e71207e02
• https://git.kernel.org/stable/c/91571643e554ae89a91942380d5f5361fb7060a2
• https://git.kernel.org/stable/c/983cc4aa7e6f633b34c3ee743771252d7afa9a90