GHSA-H862-94W3-MQRR

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33
VLAI
Details

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

batman-adv: mcast: avoid OOB read of num_dests header

Before the access to struct batadv_tvlv_mcast_tracker's num_dests, it is attempted to check whether enough space is actually in the network header. But instead of using offsetofend() to check for the whole size (2) which must be accessible, offsetof() of is called. The latter is always returning 0. The comparison with the network header length will always return that enough data is available - even when only 1 or 0 bytes are accessible.

Instead of using offsetofend(), use the more common check for the whole header.

Severity
8.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-72227"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:49Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: mcast: avoid OOB read of num_dests header\n\nBefore the access to struct batadv_tvlv_mcast_tracker\u0027s num_dests, it is\nattempted to check whether enough space is actually in the network header.\nBut instead of using offsetofend() to check for the whole size (2) which\nmust be accessible, offsetof() of is called. The latter is always returning\n0. The comparison with the network header length will always return that\nenough data is available - even when only 1 or 0 bytes are accessible.\n\nInstead of using offsetofend(), use the more common check for the whole\nheader.",
  "id": "GHSA-h862-94w3-mqrr",
  "modified": "2026-08-17T06:33:18Z",
  "published": "2026-08-15T06:32:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72227"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/38eaed28e250895d56f4b7989bd65479a511c5c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7d1a877670bc2e901241073f022ca8d1b2f85f1c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/80f62893d135f415e7a374dd47b468ec298f7aed"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2b657c9653fcebca828a2ead13f444e0da68817"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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