{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "0269ea4937343536ec7e85649932bc8c9686ea78"
            },
            {
              "fixed": "4558bd7b47c7be82dffd837f27be8ea3ecee557d"
            },
            {
              "fixed": "d5f9d050b0b267227c1f02f11021872c7768a9cc"
            },
            {
              "fixed": "4cb8b5f586e41c187942291cc0938006077fa79e"
            },
            {
              "fixed": "fac2fdac3baad9ffd12b3b0bba4374d4b3585d54"
            },
            {
              "fixed": "13ea4f86cf738c74be2146886ac261988a631e62"
            },
            {
              "fixed": "07f9ddbf5e799c24a3a52ec9bd7b729a6f6d69d5"
            },
            {
              "fixed": "5b2d4f0010018a7aa3495aa1dbf1b7a34011e7aa"
            },
            {
              "fixed": "5feba91006ec92da57acc1cc2e34df623b98541e"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.30"
            },
            {
              "fixed": "5.10.261"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72256.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_cluster: reject template conntracks in hash match\n\nxt_cluster_mt() treats any non-NULL nf_ct_get() result as a fully\ninitialized conntrack and passes it to xt_cluster_hash().\n\nThis causes a state confusion bug when the raw table CT target attaches\na template conntrack to skb-\u003e_nfct before normal conntrack processing.\nTemplates carry IPS_TEMPLATE status but do not have a valid tuple for\nhashing yet, so xt_cluster_hash() can hit its WARN_ON() path on the\nzeroed l3num field.\n\nReject template conntracks before hashing them. This matches existing\nnetfilter handling for template objects and avoids hashing incomplete\nconntrack state.",
  "id": "CVE-2026-72256",
  "modified": "2026-08-18T03:31:25.362364235Z",
  "published": "2026-08-15T05:54:43.706Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/07f9ddbf5e799c24a3a52ec9bd7b729a6f6d69d5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/13ea4f86cf738c74be2146886ac261988a631e62"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4558bd7b47c7be82dffd837f27be8ea3ecee557d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4cb8b5f586e41c187942291cc0938006077fa79e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5b2d4f0010018a7aa3495aa1dbf1b7a34011e7aa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5feba91006ec92da57acc1cc2e34df623b98541e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5f9d050b0b267227c1f02f11021872c7768a9cc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fac2fdac3baad9ffd12b3b0bba4374d4b3585d54"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72256.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72256"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "netfilter: xt_cluster: reject template conntracks in hash match"
}