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nfc: st21nfca: validate ATR_REQ length against the received frame

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: nfc: st21nfca: validate ATR_REQ length against the received frame st21nfca_tm_recv_atr_req() checks that the received ATR_REQ frame is at least ST21NFCA_ATR_REQ_MIN_SIZE and that the self-declared atr_req->length is at least sizeof(struct st21nfca_atr_req), but never checks that atr_req->length does not exceed the actual received length (skb->len). st21nfca_tm_send_atr_res() then trusts the declared length: gb_len = atr_req->length - sizeof(struct st21nfca_atr_req); ... memcpy(atr_res->gbi, atr_req->gbi, gb_len); so an RF peer that sends a short frame but sets atr_req->length larger than the frame makes gb_len exceed the general bytes actually present, and the memcpy reads out of bounds past the received skb. Those bytes are placed in the ATR_RES and sent back to the peer (kernel-memory disclosure to a proximity attacker); a larger declared length is an out-of-bounds read (DoS). Reject frames whose declared length exceeds the received length. The adjacent nfc_tm_activated() path in the same function already derives its general-bytes length from skb->len rather than the declared field. Found by 0sec (https://0sec.ai) using automated source analysis; the missing bound is evident from source. Compile-tested.

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.267, 5.15.218, 6.1.185, 6.12.106, 6.18.47, 6.6.154, 7.1.11, 7.2.1
CVEs
CVE-2026-80823
Confirmed fixed CVEs
Not specified
Updated in this feed
5 Nov 2026, 01:53 UTC · Revision 1

Source evidence

nfc: st21nfca: validate ATR_REQ length against the received frame

core-osv · Original source

Published 4 Sept 2026, 15:27 UTC

In the Linux kernel, the following vulnerability has been resolved: nfc: st21nfca: validate ATR_REQ length against the received frame st21nfca_tm_recv_atr_req() checks that the received ATR_REQ frame is at least ST21NFCA_ATR_REQ_MIN_SIZE and that the self-declared atr_req->length is at least sizeof(struct st21nfca_atr_req), but never checks that atr_req->length does not exceed the actual received length (skb->len). st21nfca_tm_send_atr_res() then trusts the declared length: gb_len = atr_req->length - sizeof(struct st21nfca_atr_req); ... memcpy(atr_res->gbi, atr_req->gbi, gb_len); so an RF peer that sends a short frame but sets atr_req->length larger than the frame makes gb_len exceed the general bytes actually present, and the memcpy reads out of bounds past the received skb. Those bytes are placed in the ATR_RES and sent back to the peer (kernel-memory disclosure to a proximity attacker); a larger declared length is an out-of-bounds read (DoS). Reject frames whose declared length exceeds the received length. The adjacent nfc_tm_activated() path in the same function already derives its general-bytes length from skb->len rather than the declared field. Found by 0sec (https://0sec.ai) using automated source analysis; the missing bound is evident from source. Compile-tested.

osv:CVE-2026-80823

Kernel

Fixed versions: 5.10.267, 5.15.218, 6.1.185, 6.6.154, 6.12.106, 6.18.47, 7.1.11, 7.2.1

Complete source record
{
  "id": "3384c981af99bb3fd0bf5a51b357cac3e644684818d395e3a8b7f656958a6758",
  "url": "https://osv.dev/vulnerability/CVE-2026-80823",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "nfc: st21nfca: validate ATR_REQ length against the received frame",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: nfc: st21nfca: validate ATR_REQ length against the received frame st21nfca_tm_recv_atr_req() checks that the received ATR_REQ frame is at least ST21NFCA_ATR_REQ_MIN_SIZE and that the self-declared atr_req->length is at least sizeof(struct st21nfca_atr_req), but never checks that atr_req->length does not exceed the actual received length (skb->len). st21nfca_tm_send_atr_res() then trusts the declared length: gb_len = atr_req->length - sizeof(struct st21nfca_atr_req); ... memcpy(atr_res->gbi, atr_req->gbi, gb_len); so an RF peer that sends a short frame but sets atr_req->length larger than the frame makes gb_len exceed the general bytes actually present, and the memcpy reads out of bounds past the received skb. Those bytes are placed in the ATR_RES and sent back to the peer (kernel-memory disclosure to a proximity attacker); a larger declared length is an out-of-bounds read (DoS). Reject frames whose declared length exceeds the received length. The adjacent nfc_tm_activated() path in the same function already derives its general-bytes length from skb->len rather than the declared field. Found by 0sec (https://0sec.ai) using automated source analysis; the missing bound is evident from source. Compile-tested.",
    "evidence": "osv:CVE-2026-80823",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.267",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.218",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.185",
            "evidence": "/affected/1/ranges"
          },
          {
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            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.106",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.47",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.11",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-80823",
      "aliases": [
        "CVE-2026-80823"
      ],
      "affected": [
        {
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              "type": "GIT",
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                },
                {
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                {
                  "fixed": "dd26d30f40c43ad9cfe2f25c6ea0ead1dd51d5aa"
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                {
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                {
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80823.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "3.17.0"
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            {
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            {
              "type": "ECOSYSTEM",
              "events": [
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80823.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:41.562651632Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0f344944c506b4f02d2b098489f7268b438c369e",
        "https://git.kernel.org/stable/c/2c1ad291f4cdc357f9527b688c6fda9c6ffa7890",
        "https://git.kernel.org/stable/c/304f5b414f4051d324b8c4a3ab0e79f7dc7e150e",
        "https://git.kernel.org/stable/c/5cdcca5d62a66eda6b774110a44cba67bc1a8d1d",
        "https://git.kernel.org/stable/c/785df00bb3ae3206674a43284eb06dac575b5c64",
        "https://git.kernel.org/stable/c/9635507fe82949e429b3cd938876a9917125b151",
        "https://git.kernel.org/stable/c/bfcca5f42c9aa4eadef1e5fe7bb23783d7fcc96d",
        "https://git.kernel.org/stable/c/dd26d30f40c43ad9cfe2f25c6ea0ead1dd51d5aa",
        "https://git.kernel.org/stable/c/f33cecf69095c43be88567fef92b180b858f7369",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80823.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80823",
        "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/2026/80xxx/CVE-2026-80823.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-80823",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 509239,
  "published_at": "2026-09-04T15:27:46.153+00:00"
}