{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "fbe68ee87522f6eaa10f9076c0a7117e1613f2f7"
            },
            {
              "fixed": "c327fa4fca31415431202e063767a7ae342e19c6"
            },
            {
              "fixed": "fc657ac0767c49839b3ef0b08dc0953ca30883f8"
            },
            {
              "fixed": "47fb3c2b4203556308e64354b3e78f2ce221d646"
            },
            {
              "fixed": "f513f308cc4bdb4530d033431592ffbc29b7fca1"
            },
            {
              "fixed": "90fd4513315ca07da99cfd8549d3e553a7160f0d"
            },
            {
              "fixed": "2abfb19bbb81958714ad1d43ebeb65b30394184b"
            },
            {
              "fixed": "2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d"
            },
            {
              "fixed": "a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.19.0"
            },
            {
              "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": "6.12.94"
            }
          ],
          "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/2026/53xxx/CVE-2026-53221.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()\n\nIn vti6_tnl_lookup(), when an exact match for a tunnel fails,\nthe code falls back to searching for wildcard tunnels:\n\n- Tunnels matching the packet's local address, with any remote address\n  wildcard remote).\n\n- Tunnels matching the packet's remote address, with any local address\n  (wildcard local).\n\nHowever, vti6 stores all these different types of tunnels in the same\nhash table (ip6n-\u003etnls_r_l) prone to hash collisions.\n\nThe bug is that the fallback search loops in vti6_tnl_lookup() were\nmissing checks to ensure that the candidate tunnel actually has\na wildcard address.",
  "id": "CVE-2026-53221",
  "modified": "2026-08-06T03:31:02.845316476Z",
  "published": "2026-06-25T08:39:23.177Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2abfb19bbb81958714ad1d43ebeb65b30394184b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/47fb3c2b4203556308e64354b3e78f2ce221d646"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/90fd4513315ca07da99cfd8549d3e553a7160f0d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c327fa4fca31415431202e063767a7ae342e19c6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f513f308cc4bdb4530d033431592ffbc29b7fca1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fc657ac0767c49839b3ef0b08dc0953ca30883f8"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53221.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53221"
    },
    {
      "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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()"
}