CVE-2026-72053

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux6c742e714d8c282fd8f8b22d3e20b5141738c1ee < 91571643e554ae89a91942380d5f5361fb7060a2affected
LinuxLinux6c742e714d8c282fd8f8b22d3e20b5141738c1ee < 983cc4aa7e6f633b34c3ee743771252d7afa9a90affected
LinuxLinux6c742e714d8c282fd8f8b22d3e20b5141738c1ee < 26544021d5c49cc6ae8a968ccb5033e6363854a4affected
LinuxLinux6c742e714d8c282fd8f8b22d3e20b5141738c1ee < 68cadc3698c7de88966d306d12ec9c6217da228aaffected
LinuxLinux6c742e714d8c282fd8f8b22d3e20b5141738c1ee < d49edcc65e0a37cc9b386a94415c5d6670ca8b71affected
LinuxLinux6c742e714d8c282fd8f8b22d3e20b5141738c1ee < 8211a26324667980a463c069469a818e71207e02affected
LinuxLinux3.12affected
LinuxLinux0 < 3.12unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References