HighFix available

NFC: digital: Bounds check NFC-A cascade depth in SDD response handler

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: NFC: digital: Bounds check NFC-A cascade depth in SDD response handler The NFC-A anti-collision cascade in digital_in_recv_sdd_res() appends 3 or 4 bytes to target->nfcid1 on each round, but the number of cascade rounds is controlled entirely by the peer device. The peer sets the cascade tag in the SDD_RES (deciding 3 vs 4 bytes) and the cascade-incomplete bit in the SEL_RES (deciding whether another round follows). ISO 14443-3 limits NFC-A to three cascade levels and target->nfcid1 is sized accordingly (NFC_NFCID1_MAXSIZE = 10), but nothing in the driver actually enforces this. This means a malicious peer can keep the cascade running, writing past the heap-allocated nfc_target with each round. Fix this by rejecting the response when the accumulated UID would exceed the buffer. Commit e329e71013c9 ("NFC: nci: Bounds check struct nfc_target arrays") fixed similar missing checks against the same field on the NCI path.

Products: Kernel
Affected versions: Not specified
Fixed versions: 5.10.258, 5.15.209, 6.1.175, 6.12.83, 6.18.24, 6.19.14, 6.6.136, 7.0.1
CVEs: CVE-2026-31622
Confirmed fixed CVEs: Not specified
Updated in this feed: 5 Nov 2026, 17:39 UTC · Revision 1

Source evidence

NFC: digital: Bounds check NFC-A cascade depth in SDD response handler

core-osv · Original source

Published 24 Apr 2026, 14:42 UTC

osv:CVE-2026-31622

Kernel

Fixed versions: 5.10.258, 5.15.209, 6.1.175, 6.6.136, 6.12.83, 6.18.24, 6.19.14, 7.0.1

Complete source record

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  "url": "https://osv.dev/vulnerability/CVE-2026-31622",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "NFC: digital: Bounds check NFC-A cascade depth in SDD response handler",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: NFC: digital: Bounds check NFC-A cascade depth in SDD response handler The NFC-A anti-collision cascade in digital_in_recv_sdd_res() appends 3 or 4 bytes to target->nfcid1 on each round, but the number of cascade rounds is controlled entirely by the peer device. The peer sets the cascade tag in the SDD_RES (deciding 3 vs 4 bytes) and the cascade-incomplete bit in the SEL_RES (deciding whether another round follows). ISO 14443-3 limits NFC-A to three cascade levels and target->nfcid1 is sized accordingly (NFC_NFCID1_MAXSIZE = 10), but nothing in the driver actually enforces this. This means a malicious peer can keep the cascade running, writing past the heap-allocated nfc_target with each round. Fix this by rejecting the response when the accumulated UID would exceed the buffer. Commit e329e71013c9 (\"NFC: nci: Bounds check struct nfc_target arrays\") fixed similar missing checks against the same field on the NCI path.",
    "evidence": "osv:CVE-2026-31622",
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      "modified": "2026-10-28T02:30:44.824963759Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-784472.html",
        "https://git.kernel.org/stable/c/1bec5698b55aa2be5c3b983dba657c01d0fd3dbc",
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        "https://git.kernel.org/stable/c/f83b399aa05a0712e3b1569a30d3d90b3533d2ef",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31622.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-31622",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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      "provider_metadata": {
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    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 512556,
  "published_at": "2026-04-24T14:42:39.916+00:00"
}