GHSA-R8HP-CX2W-5C4R

Vulnerability from github – Published: 2026-04-25 09:30 – Updated: 2026-10-15 03:35
VLAI
Details

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

bridge: br_nd_send: linearize skb before parsing ND options

br_nd_send() parses neighbour discovery options from ns->opt[] and assumes that these options are in the linear part of request.

Its callers only guarantee that the ICMPv6 header and target address are available, so the option area can still be non-linear. Parsing ns->opt[] in that case can access data past the linear buffer.

Linearize request before option parsing and derive ns from the linear network header.

Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-31682"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-25T09:16:01Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbridge: br_nd_send: linearize skb before parsing ND options\n\nbr_nd_send() parses neighbour discovery options from ns-\u003eopt[] and\nassumes that these options are in the linear part of request.\n\nIts callers only guarantee that the ICMPv6 header and target address\nare available, so the option area can still be non-linear. Parsing\nns-\u003eopt[] in that case can access data past the linear buffer.\n\nLinearize request before option parsing and derive ns from the linear\nnetwork header.",
  "id": "GHSA-r8hp-cx2w-5c4r",
  "modified": "2026-10-15T03:35:44Z",
  "published": "2026-04-25T09:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31682"
    },
    {
      "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://cert-portal.siemens.com/productcert/html/ssa-457936.html"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2ba4caba423ed94d63006eb1d2227b0332ab7fcd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a30f6469b058574f49efde61cd6f5d79e576053"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4f397b950c916e9a1f8a4fce04ea0110206cad47"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/658261898130da620fc3d0fbb0523efb3366cb55"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c55e41c73af5c4511070933b1bd25248521270c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a01aee7cafc575bb82f5529e8734e7052f9b16ea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bd91ec85aa4c77d645bd2739fc56784157a88ca2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c68433fd291c9e88c00292095172c62d1997d662"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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