{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "ad49d86e07a497e834cb06f2b151dccd75f8e148"
            },
            {
              "fixed": "0ec9ddc1bda261a2c57636c74c8b4e53000102c9"
            },
            {
              "fixed": "56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389"
            },
            {
              "fixed": "debc57b83d5b323df74bf010c8d50fe26ad2ed6b"
            },
            {
              "fixed": "0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88"
            },
            {
              "fixed": "640441348258220e78daed40528b85b8afcedab6"
            },
            {
              "fixed": "aaf80701dc2f7a48fe543961e21f8ca3924d587c"
            },
            {
              "fixed": "fbf0591275f50eae5733c3d7a8cd6c1e79933ffa"
            },
            {
              "fixed": "2fcba19caaeb2a33017459d3430f057967bb91b6"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.3.0"
            },
            {
              "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-2026-53269.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: synproxy: add mutex to guard hook reference counting\n\nAs the synproxy infrastructure register netfilter hooks on-demand when a\nuser adds the first iptables target or nftables expression, if done\nconcurrently they can race each other.\n\nIntroduce a mutex to serialize the refcount control blocks access from\nboth frontends. While a per namespace mutex might be more efficient, it\nis not needed for target/expression like SYNPROXY.",
  "id": "CVE-2026-53269",
  "modified": "2026-07-09T03:52:30.613671168Z",
  "published": "2026-06-25T08:39:55.172Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0ec9ddc1bda261a2c57636c74c8b4e53000102c9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2fcba19caaeb2a33017459d3430f057967bb91b6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/640441348258220e78daed40528b85b8afcedab6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aaf80701dc2f7a48fe543961e21f8ca3924d587c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/debc57b83d5b323df74bf010c8d50fe26ad2ed6b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fbf0591275f50eae5733c3d7a8cd6c1e79933ffa"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53269.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53269"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "netfilter: synproxy: add mutex to guard hook reference counting"
}