{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "61220ab349485d911083d0b7990ccd3db6c63297"
            },
            {
              "fixed": "12acc977838c943636fb01e2f3087d2e4cc3b7cc"
            },
            {
              "fixed": "7f28e3948c59481f8db9c9638e204258d26b4e41"
            },
            {
              "fixed": "12c65e2c7fef507551bd7b52123598a761662c01"
            },
            {
              "fixed": "f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3"
            },
            {
              "fixed": "c5dbd669db5a426b3025512322e1bf2cdbe14305"
            },
            {
              "fixed": "ecf8904067dcba0dad86ece80874841e60317885"
            },
            {
              "fixed": "dcdce3bc9f08026ff3739ee7339e1bef526fc5f3"
            },
            {
              "fixed": "d289d5307762d1838aaece22c6b6fcad9e8865f9"
            }
          ],
          "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": "5.10.260"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.211"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.177"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.144"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.95"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.36"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52909.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6_vti: set netns_immutable on the fallback device.\n\njohn1988 and Noam Rathaus reported that vti6_init_net() does not set the\nnetns_immutable flag on the per-netns fallback tunnel device (ip6_vti0).\n\nOther similar tunnel drivers (like ip6_tunnel, sit, ip6_gre, and ip_tunnel)\ncorrectly set this flag during their fallback device initialization to\nprevent them from being moved to another network namespace.",
  "id": "CVE-2026-52909",
  "modified": "2026-07-10T03:53:36.098975281Z",
  "published": "2026-06-19T14:43:33.214Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/12acc977838c943636fb01e2f3087d2e4cc3b7cc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/12c65e2c7fef507551bd7b52123598a761662c01"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7f28e3948c59481f8db9c9638e204258d26b4e41"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c5dbd669db5a426b3025512322e1bf2cdbe14305"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d289d5307762d1838aaece22c6b6fcad9e8865f9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dcdce3bc9f08026ff3739ee7339e1bef526fc5f3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ecf8904067dcba0dad86ece80874841e60317885"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52909.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52909"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ip6_vti: set netns_immutable on the fallback device."
}