In the Linux kernel, the following vulnerability has been resolved:
net: ip6gre: require CAPNET_ADMIN in the device netns for changelink
ip6grechangelink() and ip6erspanchangelink() operate on at most two netns, devnet(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 CAPNETADMIN only against devnet(dev), so a caller privileged there but not in t->net can rewrite a tunnel that lives in t->net.
Gate both ops on rtnldevlinknetcapable() at their top, before any attribute is parsed.
{
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72052.json"
}