HighFix available

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

Type: advisorySources: OSV

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).

Products: Kernel
Affected versions: Not specified
Fixed versions: 5.10.270, 5.15.221, 6.1.188, 6.12.110, 6.18.52, 6.6.157, 7.2.6
CVEs: CVE-2026-90223
Confirmed fixed CVEs: Not specified
Updated in this feed: 3 Nov 2026, 07:47 UTC · Revision 1

Source evidence

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

core-osv · Original source

Published 17 Sept 2026, 16:07 UTC

osv:CVE-2026-90223

Kernel

Fixed versions: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6

Complete source record

{
  "id": "b24d2b6db7881f956ba98b1a0ec2a349749597f0c058566d2297374ae1396fa2",
  "url": "https://osv.dev/vulnerability/CVE-2026-90223",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "nfc: llcp: bound SNL TLV parsing to the skb and add length checks",
    "summary": "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).",
    "evidence": "osv:CVE-2026-90223",
    "products": [
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        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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          {
            "value": "6.18.52",
            "evidence": "/affected/1/ranges"
          },
          {
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            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    "severity": "high",
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      "aliases": [
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      "metrics": [
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          "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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      "affected": [
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        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
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                  "introduced": "3.8.0"
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                {
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            {
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      ],
      "modified": "2026-10-28T02:30:26.865732050Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/02030f95820c42431280f4f945ff34247fb840ff",
        "https://git.kernel.org/stable/c/587fc2a5a35b41883b22b8f808fe5d345208914b",
        "https://git.kernel.org/stable/c/749a9048bf51a668ec3ab6c0392ba32325607281",
        "https://git.kernel.org/stable/c/88b36d36e12c9ba76decdb580d9c1907c084e587",
        "https://git.kernel.org/stable/c/99fdb5c2522f365efa199d0117b641e35097041e",
        "https://git.kernel.org/stable/c/eeb16fb24cfe67947b832fd9ada5f488afc72579",
        "https://git.kernel.org/stable/c/f04ac9bf2379f3e2470c400c235eb12f74891bef",
        "https://git.kernel.org/stable/c/f4c7f37f0ab990952539dc68d931d65c3657600a",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90223.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90223",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90223.json"
      }
    },
    "related_cves": [
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        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493535,
  "published_at": "2026-09-17T16:07:33.355+00:00"
}