GHSA-3JFW-V6MF-CCWX

Vulnerability from github – Published: 2026-05-08 15:31 – Updated: 2026-05-11 09:30
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

netfilter: x_tables: guard option walkers against 1-byte tail reads

When the last byte of options is a non-single-byte option kind, walkers that advance with i += op[i + 1] ? : 1 can read op[i + 1] past the end of the option area.

Add an explicit i == optlen - 1 check before dereferencing op[i + 1] in xt_tcpudp and xt_dccp option walkers.

Severity
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-43452"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-08T15:16:57Z",
    "severity": "HIGH"
  },
  "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": "GHSA-3jfw-v6mf-ccwx",
  "modified": "2026-05-11T09:30:31Z",
  "published": "2026-05-08T15:31:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43452"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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