CVE-2026-68142High· 8.8▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: geneve: require CAP_NET_ADMIN in the device netns for changelink A tunnel changelink() operates on at most two netns, dev_net(dev) and the sticky underlay netns geneve…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.1%
Last analysed / modified upstream
In the Linux kernel, the following vulnerability has been resolved:
geneve: require CAP_NET_ADMIN in the device netns for changelink
A tunnel changelink() operates on at most two netns, dev_net(dev) and the sticky underlay netns geneve->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 geneve->net can rewrite a geneve device whose underlay lives in geneve->net.
geneve_changelink() applies the new configuration against geneve->net: geneve_link_config() and the geneve_quiesce()/geneve_unquiesce() pair reopen the underlay sockets in that netns (geneve_sock_add() uses geneve->net), so the same reasoning as the tunnel changelink series applies here.
Gate geneve_changelink() with rtnl_dev_link_net_capable(), at the top of the op before any attribute is parsed, matching ipgre_changelink() and the rest of the "require CAP_NET_ADMIN in the device netns for changelink" series.
Found by 0sec automated security-research tooling (https://0sec.ai).
Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < a5522963c57f12df5f9db804ebfc472b58eef0aeLinux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < 278c6a31ee27c931c722202c8c06cc3253923254Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < 11a7d989d00160481a273eb4f7f05f64b5a6ffdfLinux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < 2abdacc927c92fa6a9cc8341e8c9b88dcb561553Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < 9de5518fc1fab583526a8f66b8e505c4864dc60aLinux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < f8c498585d2a08aa623748353c3e61467b7e9fd2Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < 95f45e20f1b2cec13823f0f68060ab4b2261b2c1Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < 8efb8f8bbb353b8f2fdf4f37534c6d96c9f69e01Linux 4.14Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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