{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "af308b94a2a4a5a27bec9028354c4df444a7c8ba"
            },
            {
              "fixed": "349df61526d2e39decc685d246202e3e284cfe05"
            },
            {
              "fixed": "55b79b1ae42372012413ce0413181d26679b17ef"
            },
            {
              "fixed": "5e9ee18b27fde88cb6148202b33916c66693fe82"
            },
            {
              "fixed": "8767fe4079affa74314d7eb3220e700150289842"
            },
            {
              "fixed": "fda6573a46ad24f35348e024905ee5bdf729797e"
            },
            {
              "fixed": "941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3"
            },
            {
              "fixed": "f9a0e4b61054cde89a2a77845293c726cc07cc43"
            },
            {
              "fixed": "c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.19.0"
            },
            {
              "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-2026-53212.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_tunnel: fix use-after-free on object destroy\n\nnft_tunnel_obj_destroy() calls metadata_dst_free() which directly\nkfree()s the metadata_dst, ignoring the dst_entry refcount. Packets\nthat took a reference via dst_hold() in nft_tunnel_obj_eval() and\nare still queued (e.g. in a netem qdisc) are left with a dangling\npointer. When these packets are eventually dequeued, dst_release()\noperates on freed memory.\n\nReplace metadata_dst_free() with dst_release() so the metadata_dst\nis freed only after all references are dropped. The dst subsystem\nalready handles metadata_dst cleanup in dst_destroy() when\nDST_METADATA is set.",
  "id": "CVE-2026-53212",
  "modified": "2026-07-15T01:49:12.918782644Z",
  "published": "2026-06-25T08:39:16.888Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/349df61526d2e39decc685d246202e3e284cfe05"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/55b79b1ae42372012413ce0413181d26679b17ef"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5e9ee18b27fde88cb6148202b33916c66693fe82"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8767fe4079affa74314d7eb3220e700150289842"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f9a0e4b61054cde89a2a77845293c726cc07cc43"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fda6573a46ad24f35348e024905ee5bdf729797e"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53212.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53212"
    },
    {
      "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:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "netfilter: nft_tunnel: fix use-after-free on object destroy"
}