{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "61220ab349485d911083d0b7990ccd3db6c63297"
            },
            {
              "fixed": "0cdce7618464f7fb06f461e8f4ad575cb1d570f4"
            },
            {
              "fixed": "f5c68875e25f331e497ddfbe81e2d8163a87f136"
            },
            {
              "fixed": "d9c5eecdb3c740e65038651db7c686b10d76d1bc"
            },
            {
              "fixed": "f1e89a943ee574d0f2f16246eb3f2d7330fdeb03"
            },
            {
              "fixed": "225b467e3b631f38be22e4b38062a1fed02fdd21"
            },
            {
              "fixed": "fc32be9ac2788524c6b24efd681cce7a6e731a92"
            },
            {
              "fixed": "ee1778ba0f5cb53be771f97017d01eb356c797bf"
            },
            {
              "fixed": "11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.15.0"
            },
            {
              "fixed": "5.10.259"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.176"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.143"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.93"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.35"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63917.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6: vti: Use ip6_tnl.net in vti6_changelink().\n\nip netns add ns1\nip netns add ns2\nip -n ns1 link add vti6_test type vti6 remote ::1 local ::2 key 7\nip -n ns1 link set vti6_test netns ns2\nip -n ns2 link set vti6_test type vti6 remote ::3 local ::4 key 9\nip netns del ns2\nip netns del ns1\n[  132.495484] ------------[ cut here ]------------\n[  132.497609] kernel BUG at net/core/dev.c:12376!\n\nCommit 61220ab34948 (\"vti6: Enable namespace changing\") dropped\nNETIF_F_NETNS_LOCAL from vti6 devices. A vti6 tunnel can then\nmove through IFLA_NET_NS_FD. After the move dev_net(dev) points\nat the new netns while t-\u003enet stays at the creation netns.\n\nvti6_changelink() and vti6_update() still use dev_net(dev) and\ndev_net(t-\u003edev). They unlink from one per netns hash and relink\ninto another. The creation netns is left with a stale entry.\ncleanup_net() of that netns later walks freed memory.\n\nReachable from an unprivileged user namespace (unshare --user\n--map-root-user --net). Cross tenant scope on container hosts.",
  "id": "CVE-2026-63917",
  "modified": "2026-07-22T05:29:59.479252563Z",
  "published": "2026-07-19T14:55:20.703Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0cdce7618464f7fb06f461e8f4ad575cb1d570f4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/225b467e3b631f38be22e4b38062a1fed02fdd21"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d9c5eecdb3c740e65038651db7c686b10d76d1bc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ee1778ba0f5cb53be771f97017d01eb356c797bf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f1e89a943ee574d0f2f16246eb3f2d7330fdeb03"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f5c68875e25f331e497ddfbe81e2d8163a87f136"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fc32be9ac2788524c6b24efd681cce7a6e731a92"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63917.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63917"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ip6: vti: Use ip6_tnl.net in vti6_changelink()."
}