{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "2e4e6a17af35be359cc8f1c924f8f198fbd478cc"
            },
            {
              "fixed": "c2a445367a496a3c25dbc940c10c8bd1cfd4c14a"
            },
            {
              "fixed": "ae1e1267650638136b84c23f2b31250f0ccb6823"
            },
            {
              "fixed": "c39f84e4be1be63fc60ca7141ea7b76edcea5907"
            },
            {
              "fixed": "9b94f0e42ed248eb31929da84ed9f5310d7ff540"
            },
            {
              "fixed": "5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c"
            },
            {
              "fixed": "bc18551c6169eac5ed813778d3e3e484002dbbe5"
            },
            {
              "fixed": "d04800323336eebf441d153f43234eac9b833d36"
            },
            {
              "fixed": "cfe770220ac2dbd3e104c6b45094037455da81d4"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.16"
            },
            {
              "fixed": "5.10.253"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.203"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.167"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.130"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.78"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.19"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43452.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: x_tables: guard option walkers against 1-byte tail reads\n\nWhen the last byte of options is a non-single-byte option kind, walkers\nthat advance with i += op[i + 1] ? : 1 can read op[i + 1] past the end\nof the option area.\n\nAdd an explicit i == optlen - 1 check before dereferencing op[i + 1]\nin xt_tcpudp and xt_dccp option walkers.",
  "id": "CVE-2026-43452",
  "modified": "2026-07-08T05:37:14.488580352Z",
  "published": "2026-05-08T14:22:17.361Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b94f0e42ed248eb31929da84ed9f5310d7ff540"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae1e1267650638136b84c23f2b31250f0ccb6823"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bc18551c6169eac5ed813778d3e3e484002dbbe5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c2a445367a496a3c25dbc940c10c8bd1cfd4c14a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c39f84e4be1be63fc60ca7141ea7b76edcea5907"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cfe770220ac2dbd3e104c6b45094037455da81d4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d04800323336eebf441d153f43234eac9b833d36"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43452.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43452"
    },
    {
      "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:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "netfilter: x_tables: guard option walkers against 1-byte tail reads"
}