In the Linux kernel, the following vulnerability has been resolved: net: ip6_tunnel: require CAP_NET_ADMIN in the device netns for changelink ip6_tnl_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 ip6_tnl_changelink() on rtnl_dev_link_net_capable() at its top, before any attribute is parsed.
Fix
Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.
Change history 3
- StatusReceived → PublishedNVD modified 2026-10-19 21:19
- CwesCWE-862NVD modified 2026-10-19 22:17
- First seenCVSS 8.8NVD modified 2026-10-16 16:20
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.
References 8
- https://git.kernel.org/stable/c/234cd54fc500f69db43e37de38603da617fbbeea
- https://git.kernel.org/stable/c/2496fa0b7d180b3ad356b514e7ff93bb14e6140a
- https://git.kernel.org/stable/c/2636d061bc237a2446a146e42dcc6563acfa7432
- https://git.kernel.org/stable/c/2d53ee7daabe733deb81f51d2cc90188f8ad59a1
- https://git.kernel.org/stable/c/5252db8fb604321133138c7069d6fc3fcd89cdee
- https://git.kernel.org/stable/c/7f68f7928484f463a5bc0d50e6fdd8d16f55a5aa
- https://git.kernel.org/stable/c/82e53e7281c71e174f9f5877c566a623c637b406
- https://git.kernel.org/stable/c/d4bcc202a3530c856e1cb183384bc9cc8fddab22