GHSA-QGH9-FCM6-V6PG

Vulnerability from github – Published: 2026-04-03 18:31 – Updated: 2026-07-14 15:31
VLAI
Details

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

netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case

In decode_int(), the CONS case calls get_bits(bs, 2) to read a length value, then calls get_uint(bs, len) without checking that len bytes remain in the buffer. The existing boundary check only validates the 2 bits for get_bits(), not the subsequent 1-4 bytes that get_uint() reads. This allows a malformed H.323/RAS packet to cause a 1-4 byte slab-out-of-bounds read.

Add a boundary check for len bytes after get_bits() and before get_uint().

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-2026-23456"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-03T16:16:32Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case\n\nIn decode_int(), the CONS case calls get_bits(bs, 2) to read a length\nvalue, then calls get_uint(bs, len) without checking that len bytes\nremain in the buffer. The existing boundary check only validates the\n2 bits for get_bits(), not the subsequent 1-4 bytes that get_uint()\nreads. This allows a malformed H.323/RAS packet to cause a 1-4 byte\nslab-out-of-bounds read.\n\nAdd a boundary check for len bytes after get_bits() and before\nget_uint().",
  "id": "GHSA-qgh9-fcm6-v6pg",
  "modified": "2026-07-14T15:31:46Z",
  "published": "2026-04-03T18:31:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23456"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1e3a3593162c96e8a8de48b1e14f60c3b57fca8a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41b417ff73a24b2c68134992cc44c88db27f482d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/52235bf88159a1ef16434ab49e47e99c8a09ab20"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6bce72daeccca9aa1746e92d6c3d4784e71f2ebb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/774a434f8c9c8602a976b2536f65d0172a07f4d2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a2cd54b9348e485d338b3c132338a4410c99afaf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c95dc674ebf01ecfb40388b6facfc89b81fed3b7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fb6c3596823ec5dd09c2123340330d7448f51a59"
    }
  ],
  "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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