Answer in brief
CVE-2026-31622 records a High severity (CVSS 8.8) vulnerability in NFC: digital: Bounds check NFC-A cascade depth in SDD response handler. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | 3.13 | Not reported |
| Linux/Linuxgeneric | >=2c66daecc4092e6049673c281b2e6f0d5e59a94c <9ba6bb09e00b922d902f684f575779e5433fe6e3 || >=2c66daecc4092e6049673c281b2e6f0d5e59a94c <f83b399aa05a0712e3b1569a30d3d90b3533d2ef || >=2c66daecc4092e6049673c281b2e6f0d5e59a94c <20663102c14566e900e1d2f679e30b7f1694f387 || >=2c66daecc4092e6049673c281b2e6f0d5e59a94c <2819f34e08bdffb6f06a51c67948ec5737fb166a || >=2c66daecc4092e6049673c281b2e6f0d5e59a94c <1bec5698b55aa2be5c3b983dba657c01d0fd3dbc || >=2c66daecc4092e6049673c281b2e6f0d5e59a94c <5a59bf70c38ee1eb4be03bab830bbc3a6f0bd1f1 || >=2c66daecc4092e6049673c281b2e6f0d5e59a94c <8d9d9bf3565271ca7ab9c716a94e87296177e7ba || >=2c66daecc4092e6049673c281b2e6f0d5e59a94c <cc024a3de265ef6c58957f4990eccb9f806208cb || >=2c66daecc4092e6049673c281b2e6f0d5e59a94c <46ce8be2ced389bccd84bcc04a12cf2f4d0c22d1 | 9ba6bb09e00b922d902f684f575779e5433fe6e3, f83b399aa05a0712e3b1569a30d3d90b3533d2ef, 20663102c14566e900e1d2f679e30b7f1694f387, 2819f34e08bdffb6f06a51c67948ec5737fb166a, 1bec5698b55aa2be5c3b983dba657c01d0fd3dbc, 5a59bf70c38ee1eb4be03bab830bbc3a6f0bd1f1, 8d9d9bf3565271ca7ab9c716a94e87296177e7ba, cc024a3de265ef6c58957f4990eccb9f806208cb, 46ce8be2ced389bccd84bcc04a12cf2f4d0c22d1 |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Apr 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.