CVE-2026-72052

Description

In the Linux kernel, the following vulnerability has been resolved: net: ip6_gre: require CAP_NET_ADMIN in the device netns for changelink ip6gre_changelink() and ip6erspan_changelink() operate 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 both ops on rtnl_dev_link_net_capable() at their top, before any attribute is parsed.

References

• https://git.kernel.org/stable/c/03d8843b143ebbbfaf48511922abc6e886575a61
• https://git.kernel.org/stable/c/0caa9f348f8b5356900de77b0bb89a697c4aff20
• https://git.kernel.org/stable/c/129f8939e5af683cec3a1a5edcb40a64636ad81e
• https://git.kernel.org/stable/c/1d4d8ee002083ca4ead5353662bf8362428af57f
• https://git.kernel.org/stable/c/220162c9fedbe992da70d70f50a10da4f45f914c