Skip to content
Heist/ feed
High

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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-31622

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-31622

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2c66daecc4092e6049673c281b2e6f0d5e59a94c",
        "lessThan": "9ba6bb09e00b922d902f684f575779e5433fe6e3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2c66daecc4092e6049673c281b2e6f0d5e59a94c",
        "lessThan": "f83b399aa05a0712e3b1569a30d3d90b3533d2ef",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2c66daecc4092e6049673c281b2e6f0d5e59a94c",
        "lessThan": "20663102c14566e900e1d2f679e30b7f1694f387",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2c66daecc4092e6049673c281b2e6f0d5e59a94c",
        "lessThan": "2819f34e08bdffb6f06a51c67948ec5737fb166a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2c66daecc4092e6049673c281b2e6f0d5e59a94c",
        "lessThan": "1bec5698b55aa2be5c3b983dba657c01d0fd3dbc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2c66daecc4092e6049673c281b2e6f0d5e59a94c",
        "lessThan": "5a59bf70c38ee1eb4be03bab830bbc3a6f0bd1f1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2c66daecc4092e6049673c281b2e6f0d5e59a94c",
        "lessThan": "8d9d9bf3565271ca7ab9c716a94e87296177e7ba",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2c66daecc4092e6049673c281b2e6f0d5e59a94c",
        "lessThan": "cc024a3de265ef6c58957f4990eccb9f806208cb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2c66daecc4092e6049673c281b2e6f0d5e59a94c",
        "lessThan": "46ce8be2ced389bccd84bcc04a12cf2f4d0c22d1",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/nfc/digital_technology.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.13"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.13",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.258",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.209",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.136",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.83",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.24",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.14",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.1",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/nfc/digital_technology.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-31622

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#28300 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement