GHSA-MF85-825J-JWWX

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:

netfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop

The ah, hbh and rt matches check that the fixed extension header is present, then use the header length field to derive the advertised extension header length for matching.

For the ah match, add the missing advertised-length check. For hbh and rt, update the existing advertised-length checks. In all three cases, set hotdrop to true before returning false when the advertised extension header length exceeds the available skb data.

Returning false treats the packet as a rule mismatch. Set hotdrop to true and drop malformed packets so they cannot bypass rules intended to drop packets with these IPv6 extension headers.

Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
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{
  "affected": [],
  "aliases": [
    "CVE-2026-72348"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:08Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop\n\nThe ah, hbh and rt matches check that the fixed extension header is\npresent, then use the header length field to derive the advertised\nextension header length for matching.\n\nFor the ah match, add the missing advertised-length check. For hbh\nand rt, update the existing advertised-length checks. In all three\ncases, set hotdrop to true before returning false when the advertised\nextension header length exceeds the available skb data.\n\nReturning false treats the packet as a rule mismatch. Set hotdrop to\ntrue and drop malformed packets so they cannot bypass rules intended\nto drop packets with these IPv6 extension headers.",
  "id": "GHSA-mf85-825j-jwwx",
  "modified": "2026-08-17T06:33:24Z",
  "published": "2026-08-15T06:32:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72348"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2fd89a50a9783eed8ed23866b11c8b3d8779a7a8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3578b6d92a5b1e603ae6e8c8f5538a709f03aba4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d441be2b1c5e98167302fa1c7b61960a067b112"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/43ccc20b5a733226417832cf16ef45322e594990"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5e39e5eb6b30bc4a3bb7aba54c293cf36a806c7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f16d856b6af5fd0e7cb0b0212f70825b599ef72e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f775fcf384b06f35b612f78fa5601fee99eb6513"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fc416870100cf16d5b9495199355a679c3a02d48"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}



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