vxlan: require CAP_NET_ADMIN in the device netns for changelink

{
  "id": "d8008b4f44b17192f1a7a36a0eb9f0394e8b0c138b2cd0df98f9c31a441ed314",
  "url": "https://osv.dev/vulnerability/CVE-2026-68432",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "vxlan: require CAP_NET_ADMIN in the device netns for changelink",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: vxlan: 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 vxlan->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 vxlan->net can rewrite a vxlan device whose underlay lives in vxlan->net. vxlan_changelink() validates and applies the new configuration against vxlan->net (vxlan_config_validate(vxlan->net, ...)) and can reopen the underlay socket in that netns, so the same reasoning as the tunnel changelink series applies here. Gate vxlan_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).",
    "evidence": "osv:CVE-2026-68432",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.265",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.216",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.183",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.148",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.101",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.42",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-68432",
      "aliases": [
        "CVE-2026-68432"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "8bcdc4f3a20be949df54b67e5ae2734daabb5792"
                },
                {
                  "fixed": "b95a8743e58f7efed5ddc4cb73829b66f17feab0"
                },
                {
                  "fixed": "7465ade989ba84adc2bfa58bad3ca25d249f0f7a"
                },
                {
                  "fixed": "0aa580a8bbbed2507b4582a1f0ef581d480d06ed"
                },
                {
                  "fixed": "b3793d7dccb192ffff29894d11824db6251acdd5"
                },
                {
                  "fixed": "32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f"
                },
                {
                  "fixed": "730c7e5fea7f06e0cdf21c547222ec93234fd1d6"
                },
                {
                  "fixed": "e8ad0d311e225939a9a6c745d6cc384c7364ec87"
                },
                {
                  "fixed": "3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68432.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.11.0"
                },
                {
                  "fixed": "5.10.265"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.216"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.183"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.148"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.101"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.42"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68432.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.728742475Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0aa580a8bbbed2507b4582a1f0ef581d480d06ed",
        "https://git.kernel.org/stable/c/32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f",
        "https://git.kernel.org/stable/c/3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e",
        "https://git.kernel.org/stable/c/730c7e5fea7f06e0cdf21c547222ec93234fd1d6",
        "https://git.kernel.org/stable/c/7465ade989ba84adc2bfa58bad3ca25d249f0f7a",
        "https://git.kernel.org/stable/c/b3793d7dccb192ffff29894d11824db6251acdd5",
        "https://git.kernel.org/stable/c/b95a8743e58f7efed5ddc4cb73829b66f17feab0",
        "https://git.kernel.org/stable/c/e8ad0d311e225939a9a6c745d6cc384c7364ec87",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68432.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-68432",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68432.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-68432",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 513893,
  "published_at": "2026-08-12T00:07:18.806+00:00"
}