{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-90223",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-90223"
  ],
  "published": "2026-09-17T16:10:40Z",
  "summary": "nfc: llcp: bound SNL TLV parsing to the skb and add length checks",
  "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->len, without bounding reads to the actual skb\ndata. Three problems followed:\n\n  - For a short frame (skb->len < 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 (>= 1) and SDRES (exactly 2).\n\nFound by 0sec automated security-research tooling (https://0sec.ai).",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-90223"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/88b36d36e12c9ba76decdb580d9c1907c084e587"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/587fc2a5a35b41883b22b8f808fe5d345208914b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f04ac9bf2379f3e2470c400c235eb12f74891bef"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/02030f95820c42431280f4f945ff34247fb840ff"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/99fdb5c2522f365efa199d0117b641e35097041e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/749a9048bf51a668ec3ab6c0392ba32325607281"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/eeb16fb24cfe67947b832fd9ada5f488afc72579"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f4c7f37f0ab990952539dc68d931d65c3657600a"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-18T17:55:42Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - A nearby NFC-DEP peer supplies the malformed bytes in an LLCP SNL PDU (ptype LLCP_PDU_SNL, DSAP/SSAP LLCP_SAP_SDP). nfc_tm_data_received() or the initiator nfc_llcp_recv() callback delivers that skb through __nfc_llcp_recv() and nfc_llcp_rx_skb() into nfc_llcp_recv_snl(), which walks attacker-controlled SDREQ/SDRES TLVs. NFC is radio-range, so Adjacent.\nAC:L - The attacker fully controls the SNL payload, including each TLV type and u8 length. An SDREQ with length 0 or 15, or a declared length past the remaining skb, hits the missing header/value checks in nfc_llcp_recv_snl() deterministically, with no race or heap layout the attacker cannot set.\nPR:N - nfc_llcp_recv_snl() only rejects PDUs whose DSAP/SSAP are not LLCP_SAP_SDP; it does not require LLCP CONNECT, SDP credentials, or any host account. After nfc_dep_link_is_up(), an unauthenticated NFC-DEP peer can send SNL immediately.\nUI:N - nfc_tm_activated() calls nfc_dep_link_is_up() automatically when protocol is NFC_PROTO_NFC_DEP_MASK, after which nfc_tm_data_received() hands DEP payloads to LLCP. The attacker triggers the SNL parse with their own frames; no extra victim click, mount, or dialog is required.\nS:U - nfc_llcp_recv_snl() over-reads kernel memory adjacent to the received skb in the LLCP receive path. That stays inside the host kernel's security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:L - A short SDREQ with length==15 makes strncmp(service_name, \"urn:nfc:sn:sdp\", 14) read up to 14 bytes past the skb, and length==0 uses out-of-bounds tlv[2] as the tid echoed by nfc_llcp_build_sdres_tlv(). nfc_llcp_sock_from_sn() memcmp is gated on matching socket name length, so this is a small bounded leak, not an arbitrary read.\nI:N - The SNL walker only reads past the skb; it does not write past it. The SDRES path assigns tlv[3] into an existing pending nfc_llcp_sdp_tlv->sap on a tid match, which is an in-object protocol field a well-formed SDRES can already set, not a kernel write primitive.\nA:H - nfc_llcp_recv_snl() can read tlv[0]/tlv[1] when fewer than two bytes remain, and strncmp()/tlv[2] past the skb tail. Those over-reads can fault on an unmapped page or KFENCE guard and oops the kernel."
    }
  }
}