CVE-2026-31622

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

State: Published
Severity: 8.8 High
Published: Apr 24, 2026
Updated: Oct 15, 2026
Reserved: Mar 9, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	2c66daecc4092e6049673c281b2e6f0d5e59a94c to before 9ba6bb09e00b922d902f684f575779e5433fe6e3Affected 2c66daecc4092e6049673c281b2e6f0d5e59a94c to before f83b399aa05a0712e3b1569a30d3d90b3533d2efAffected 2c66daecc4092e6049673c281b2e6f0d5e59a94c to before 20663102c14566e900e1d2f679e30b7f1694f387Affected 2c66daecc4092e6049673c281b2e6f0d5e59a94c to before 2819f34e08bdffb6f06a51c67948ec5737fb166aAffected 2c66daecc4092e6049673c281b2e6f0d5e59a94c to before 1bec5698b55aa2be5c3b983dba657c01d0fd3dbcAffected 2c66daecc4092e6049673c281b2e6f0d5e59a94c to before 5a59bf70c38ee1eb4be03bab830bbc3a6f0bd1f1Affected 2c66daecc4092e6049673c281b2e6f0d5e59a94c to before 8d9d9bf3565271ca7ab9c716a94e87296177e7baAffected 2c66daecc4092e6049673c281b2e6f0d5e59a94c to before cc024a3de265ef6c58957f4990eccb9f806208cbAffected 2c66daecc4092e6049673c281b2e6f0d5e59a94c to before 46ce8be2ced389bccd84bcc04a12cf2f4d0c22d1Affected
LinuxLinux	3.13Affected before 3.13Not affected 5.10.258 through 5.10.Not affected 5.15.209 through 5.15.Not affected 6.1.175 through 6.1.Not affected 6.6.136 through 6.6.Not affected 6.12.83 through 6.12.Not affected 6.18.24 through 6.18.Not affected 6.19.14 through 6.19.Not affected 7.0.1 through 7.0.Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

2c66daecc4092e6049673c281b2e6f0d5e59a94c to before 9ba6bb09e00b922d902f684f575779e5433fe6e3Affected
2c66daecc4092e6049673c281b2e6f0d5e59a94c to before f83b399aa05a0712e3b1569a30d3d90b3533d2efAffected
2c66daecc4092e6049673c281b2e6f0d5e59a94c to before 20663102c14566e900e1d2f679e30b7f1694f387Affected
2c66daecc4092e6049673c281b2e6f0d5e59a94c to before 2819f34e08bdffb6f06a51c67948ec5737fb166aAffected
2c66daecc4092e6049673c281b2e6f0d5e59a94c to before 1bec5698b55aa2be5c3b983dba657c01d0fd3dbcAffected
2c66daecc4092e6049673c281b2e6f0d5e59a94c to before 5a59bf70c38ee1eb4be03bab830bbc3a6f0bd1f1Affected
2c66daecc4092e6049673c281b2e6f0d5e59a94c to before 8d9d9bf3565271ca7ab9c716a94e87296177e7baAffected
2c66daecc4092e6049673c281b2e6f0d5e59a94c to before cc024a3de265ef6c58957f4990eccb9f806208cbAffected
2c66daecc4092e6049673c281b2e6f0d5e59a94c to before 46ce8be2ced389bccd84bcc04a12cf2f4d0c22d1Affected

LinuxLinux

3.13Affected
before 3.13Not affected
5.10.258 through 5.10.*Not affected
5.15.209 through 5.15.*Not affected
6.1.175 through 6.1.*Not affected
6.6.136 through 6.6.*Not affected
6.12.83 through 6.12.*Not affected
6.18.24 through 6.18.*Not affected
6.19.14 through 6.19.*Not affected
7.0.1 through 7.0.*Not affected
7.1 and laterNot affected

References

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