CVE-2026-31622 (GCVE-0-2026-31622)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-04-27 14:04
VLAI?
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.
Severity ?
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2c66daecc4092e6049673c281b2e6f0d5e59a94c , < 2819f34e08bdffb6f06a51c67948ec5737fb166a (git)
Affected: 2c66daecc4092e6049673c281b2e6f0d5e59a94c , < 1bec5698b55aa2be5c3b983dba657c01d0fd3dbc (git)
Affected: 2c66daecc4092e6049673c281b2e6f0d5e59a94c , < 5a59bf70c38ee1eb4be03bab830bbc3a6f0bd1f1 (git)
Affected: 2c66daecc4092e6049673c281b2e6f0d5e59a94c , < 8d9d9bf3565271ca7ab9c716a94e87296177e7ba (git)
Affected: 2c66daecc4092e6049673c281b2e6f0d5e59a94c , < cc024a3de265ef6c58957f4990eccb9f806208cb (git)
Affected: 2c66daecc4092e6049673c281b2e6f0d5e59a94c , < 46ce8be2ced389bccd84bcc04a12cf2f4d0c22d1 (git)
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    Linux Linux Affected: 3.13
Unaffected: 0 , < 3.13 (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)
Unaffected: 7.1-rc1 , ≤ * (original_commit_for_fix)
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}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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