{"id":"CVE-2026-68142","title":"geneve: require CAP_NET_ADMIN in the device netns for changelink","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ngeneve: require CAP_NET_ADMIN in the device netns for changelink\n\nA tunnel changelink() operates on at most two netns, dev_net(dev) and\nthe sticky underlay netns geneve…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < a5522963c57f12df5f9db804ebfc472b58eef0ae","Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < 278c6a31ee27c931c722202c8c06cc3253923254","Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < 11a7d989d00160481a273eb4f7f05f64b5a6ffdf","Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < 2abdacc927c92fa6a9cc8341e8c9b88dcb561553","Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < 9de5518fc1fab583526a8f66b8e505c4864dc60a","Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < f8c498585d2a08aa623748353c3e61467b7e9fd2","Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < 95f45e20f1b2cec13823f0f68060ab4b2261b2c1","Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < 8efb8f8bbb353b8f2fdf4f37534c6d96c9f69e01","Linux 4.14"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:44:41.067135Z"},"published":"2026-08-10","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:52:59.619Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68142","references":[{"url":"https://git.kernel.org/stable/c/a5522963c57f12df5f9db804ebfc472b58eef0ae"},{"url":"https://git.kernel.org/stable/c/278c6a31ee27c931c722202c8c06cc3253923254"},{"url":"https://git.kernel.org/stable/c/11a7d989d00160481a273eb4f7f05f64b5a6ffdf"},{"url":"https://git.kernel.org/stable/c/2abdacc927c92fa6a9cc8341e8c9b88dcb561553"},{"url":"https://git.kernel.org/stable/c/9de5518fc1fab583526a8f66b8e505c4864dc60a"},{"url":"https://git.kernel.org/stable/c/f8c498585d2a08aa623748353c3e61467b7e9fd2"},{"url":"https://git.kernel.org/stable/c/95f45e20f1b2cec13823f0f68060ab4b2261b2c1"},{"url":"https://git.kernel.org/stable/c/8efb8f8bbb353b8f2fdf4f37534c6d96c9f69e01"}],"tags":["cve.org"],"epss":0.00139,"epssPercentile":0.02893,"ingestedAt":"2026-10-16T17:24:46.843Z","slug":"CVE-2026-68142","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ngeneve: require CAP_NET_ADMIN in the device netns for changelink\n\nA tunnel changelink() operates on at most two netns, dev_net(dev) and\nthe sticky underlay netns geneve->net. They differ once the device is\ncreated in or moved to a netns other than the one the request runs in.\nThe rtnl changelink path checks CAP_NET_ADMIN only against dev_net(dev),\nso a caller privileged there but not in geneve->net can rewrite a geneve\ndevice whose underlay lives in geneve->net.\n\ngeneve_changelink() applies the new configuration against geneve->net:\ngeneve_link_config() and the geneve_quiesce()/geneve_unquiesce() pair\nreopen the underlay sockets in that netns (geneve_sock_add() uses\ngeneve->net), so the same reasoning as the tunnel changelink series\napplies here.\n\nGate geneve_changelink() with rtnl_dev_link_net_capable(), at the top of\nthe op before any attribute is parsed, matching ipgre_changelink() and\nthe rest of the \"require CAP_NET_ADMIN in the device netns for\nchangelink\" series.\n\nFound by 0sec automated security-research tooling (https://0sec.ai).\n\n## Affected\n\n- `Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < a5522963c57f12df5f9db804ebfc472b58eef0ae`\n- `Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < 278c6a31ee27c931c722202c8c06cc3253923254`\n- `Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < 11a7d989d00160481a273eb4f7f05f64b5a6ffdf`\n- `Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < 2abdacc927c92fa6a9cc8341e8c9b88dcb561553`\n- `Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < 9de5518fc1fab583526a8f66b8e505c4864dc60a`\n- `Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < f8c498585d2a08aa623748353c3e61467b7e9fd2`\n- `Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < 95f45e20f1b2cec13823f0f68060ab4b2261b2c1`\n- `Linux >= 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a < 8efb8f8bbb353b8f2fdf4f37534c6d96c9f69e01`\n- `Linux 4.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}