GHSA-JXPM-782W-87PH

Vulnerability from github – Published: 2026-09-17 18:31 – Updated: 2026-09-18 18:31
VLAI
Details

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

nfc: llcp: bound SNL TLV parsing to the skb and add length checks

nfc_llcp_recv_snl() walked the SNL TLV list using a u16 offset/length pair derived from skb->len, without bounding reads to the actual skb data. Three problems followed:

  • For a short frame (skb->len < LLCP_HEADER_SIZE), tlv_len underflowed.
  • The per-TLV header (type, length) was read without checking that two bytes remained.
  • A declared TLV length could run past the end of the buffer, and an SDREQ with length == 0 made "service_name_len = length - 1" underflow (size_t), driving an out-of-bounds read in the following strncmp() / nfc_llcp_sock_from_sn(). The SDRES case likewise read tlv[2]/tlv[3] without a length check.

A nearby NFC device can reach this without authentication; LLCP link activation happens automatically after NFC-DEP.

Walk the TLV list by pointer, bounded by skb_tail_pointer() over the linear skb data, and validate each TLV declared length before use. Add explicit length checks for SDREQ (>= 1) and SDRES (exactly 2).

Found by 0sec automated security-research tooling (https://0sec.ai).

Severity
7.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-90223"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:17:17Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: bound SNL TLV parsing to the skb and add length checks\n\nnfc_llcp_recv_snl() walked the SNL TLV list using a u16 offset/length\npair derived from skb-\u003elen, without bounding reads to the actual skb\ndata. Three problems followed:\n\n  - For a short frame (skb-\u003elen \u003c LLCP_HEADER_SIZE), tlv_len underflowed.\n  - The per-TLV header (type, length) was read without checking that two\n    bytes remained.\n  - A declared TLV length could run past the end of the buffer, and an\n    SDREQ with length == 0 made \"service_name_len = length - 1\" underflow\n    (size_t), driving an out-of-bounds read in the following strncmp() /\n    nfc_llcp_sock_from_sn(). The SDRES case likewise read tlv[2]/tlv[3]\n    without a length check.\n\nA nearby NFC device can reach this without authentication; LLCP link\nactivation happens automatically after NFC-DEP.\n\nWalk the TLV list by pointer, bounded by skb_tail_pointer() over the\nlinear skb data, and validate each TLV declared length before use. Add\nexplicit length checks for SDREQ (\u003e= 1) and SDRES (exactly 2).\n\nFound by 0sec automated security-research tooling (https://0sec.ai).",
  "id": "GHSA-jxpm-782w-87ph",
  "modified": "2026-09-18T18:31:27Z",
  "published": "2026-09-17T18:31:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90223"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/02030f95820c42431280f4f945ff34247fb840ff"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/587fc2a5a35b41883b22b8f808fe5d345208914b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/749a9048bf51a668ec3ab6c0392ba32325607281"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/88b36d36e12c9ba76decdb580d9c1907c084e587"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/99fdb5c2522f365efa199d0117b641e35097041e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eeb16fb24cfe67947b832fd9ada5f488afc72579"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f04ac9bf2379f3e2470c400c235eb12f74891bef"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f4c7f37f0ab990952539dc68d931d65c3657600a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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