GHSA-8VVQ-JJHC-WFC4

Vulnerability from github – Published: 2026-10-18 18:31 – Updated: 2026-10-18 18:31
VLAI
Details

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

nfc: llcp: drop truncated I/RR/RNR PDUs in nfc_llcp_recv_hdlc()

nfc_llcp_recv_hdlc() reads the sequence byte skb->data[2], via nfc_llcp_ns()/nfc_llcp_nr(), before any length check. The receive path only guarantees the two-byte LLCP header -- __nfc_llcp_recv() checks it with pskb_may_pull() and nfc_llcp_recv_agf() admits two-byte inner PDUs -- so a two-byte I, RR or RNR PDU reads one byte of uninitialised skb tailroom. The byte becomes N(R)/N(S); a peer can already set those with a well-formed PDU, so this is acting on uninitialised memory, not new peer control.

Guard the read with pskb_may_pull(), as commit 95674f506c63 ("nfc: llcp: reject PDUs shorter than the LLCP header") did for the two-byte header, so the sequence byte is present and linear before it is read. RR and RNR PDUs are LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE bytes and an I PDU is longer, so no valid frame is rejected; a truncated PDU is malformed, so return without a DM reply.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98482"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:16:58Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: drop truncated I/RR/RNR PDUs in nfc_llcp_recv_hdlc()\n\nnfc_llcp_recv_hdlc() reads the sequence byte skb-\u003edata[2], via\nnfc_llcp_ns()/nfc_llcp_nr(), before any length check. The receive path\nonly guarantees the two-byte LLCP header -- __nfc_llcp_recv() checks it\nwith pskb_may_pull() and nfc_llcp_recv_agf() admits two-byte inner PDUs\n-- so a two-byte I, RR or RNR PDU reads one byte of uninitialised skb\ntailroom. The byte becomes N(R)/N(S); a peer can already set those with\na well-formed PDU, so this is acting on uninitialised memory, not new\npeer control.\n\nGuard the read with pskb_may_pull(), as commit 95674f506c63 (\"nfc: llcp:\nreject PDUs shorter than the LLCP header\") did for the two-byte header,\nso the sequence byte is present and linear before it is read. RR and RNR\nPDUs are LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE bytes and an I PDU is\nlonger, so no valid frame is rejected; a truncated PDU is malformed, so\nreturn without a DM reply.",
  "id": "GHSA-8vvq-jjhc-wfc4",
  "modified": "2026-10-18T18:31:50Z",
  "published": "2026-10-18T18:31:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98482"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/066205553a0106565bcede934f5721c25ebd6e4e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18f60ee882403d5b48097f5f6ae45f794e4cc643"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/273f9d667cde649f8de9d72b1303cc2f4b658c50"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3afdbebfee2ef7e9510880868cfb482cbffe6836"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/51b6d73373589abb9de4d84767b0db1bc8d395d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/744e61bd06188d8bb068c26a461c252f242b05c9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/810f204ef8f61f0c930cf6b3280050b3ee6a8ae7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b4086eb67a9a3b1ce69fef1b6793827363703ce"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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