{"id":"CVE-2026-68432","title":"vxlan: require CAP_NET_ADMIN in the device netns for changelink","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: 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 vxlan->…","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 >= 8bcdc4f3a20be949df54b67e5ae2734daabb5792 < b95a8743e58f7efed5ddc4cb73829b66f17feab0","Linux >= 8bcdc4f3a20be949df54b67e5ae2734daabb5792 < 7465ade989ba84adc2bfa58bad3ca25d249f0f7a","Linux >= 8bcdc4f3a20be949df54b67e5ae2734daabb5792 < 0aa580a8bbbed2507b4582a1f0ef581d480d06ed","Linux >= 8bcdc4f3a20be949df54b67e5ae2734daabb5792 < b3793d7dccb192ffff29894d11824db6251acdd5","Linux >= 8bcdc4f3a20be949df54b67e5ae2734daabb5792 < 32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f","Linux >= 8bcdc4f3a20be949df54b67e5ae2734daabb5792 < 730c7e5fea7f06e0cdf21c547222ec93234fd1d6","Linux >= 8bcdc4f3a20be949df54b67e5ae2734daabb5792 < e8ad0d311e225939a9a6c745d6cc384c7364ec87","Linux >= 8bcdc4f3a20be949df54b67e5ae2734daabb5792 < 3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e","Linux 4.11"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:48:52.480523Z"},"published":"2026-08-12","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:53:13.375Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68432","references":[{"url":"https://git.kernel.org/stable/c/b95a8743e58f7efed5ddc4cb73829b66f17feab0"},{"url":"https://git.kernel.org/stable/c/7465ade989ba84adc2bfa58bad3ca25d249f0f7a"},{"url":"https://git.kernel.org/stable/c/0aa580a8bbbed2507b4582a1f0ef581d480d06ed"},{"url":"https://git.kernel.org/stable/c/b3793d7dccb192ffff29894d11824db6251acdd5"},{"url":"https://git.kernel.org/stable/c/32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f"},{"url":"https://git.kernel.org/stable/c/730c7e5fea7f06e0cdf21c547222ec93234fd1d6"},{"url":"https://git.kernel.org/stable/c/e8ad0d311e225939a9a6c745d6cc384c7364ec87"},{"url":"https://git.kernel.org/stable/c/3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e"}],"tags":["cve.org"],"epss":0.0013,"epssPercentile":0.02305,"ingestedAt":"2026-10-16T17:24:46.866Z","slug":"CVE-2026-68432","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: 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 vxlan->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 vxlan->net can rewrite a vxlan\ndevice whose underlay lives in vxlan->net.\n\nvxlan_changelink() validates and applies the new configuration against\nvxlan->net (vxlan_config_validate(vxlan->net, ...)) and can reopen the\nunderlay socket in that netns, so the same reasoning as the tunnel\nchangelink series applies here.\n\nGate vxlan_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 >= 8bcdc4f3a20be949df54b67e5ae2734daabb5792 < b95a8743e58f7efed5ddc4cb73829b66f17feab0`\n- `Linux >= 8bcdc4f3a20be949df54b67e5ae2734daabb5792 < 7465ade989ba84adc2bfa58bad3ca25d249f0f7a`\n- `Linux >= 8bcdc4f3a20be949df54b67e5ae2734daabb5792 < 0aa580a8bbbed2507b4582a1f0ef581d480d06ed`\n- `Linux >= 8bcdc4f3a20be949df54b67e5ae2734daabb5792 < b3793d7dccb192ffff29894d11824db6251acdd5`\n- `Linux >= 8bcdc4f3a20be949df54b67e5ae2734daabb5792 < 32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f`\n- `Linux >= 8bcdc4f3a20be949df54b67e5ae2734daabb5792 < 730c7e5fea7f06e0cdf21c547222ec93234fd1d6`\n- `Linux >= 8bcdc4f3a20be949df54b67e5ae2734daabb5792 < e8ad0d311e225939a9a6c745d6cc384c7364ec87`\n- `Linux >= 8bcdc4f3a20be949df54b67e5ae2734daabb5792 < 3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e`\n- `Linux 4.11`\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":[]}