CVE-2026-31622NFC: digital: Bounds check NFC-A cascade depth in SDD response handler
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 2c66daecc4092e6049673c281b2e6f0d5e59a94c before 9ba6bb09e00b922d902f684f575779e5433fe6e3; from 2c66daecc4092e6049673c281b2e6f0d5e59a94c before f83b399aa05a0712e3b1569a30d3d90b3533d2ef; from 2c66daecc4092e6049673c281b2e6f0d5e59a94c before 20663102c14566e900e1d2f679e30b7f1694f387; from 2c66daecc4092e6049673c281b2e6f0d5e59a94c before 2819f34e08bdffb6f06a51c67948ec5737fb166a; 2c66daecc4092e6049673c281b2e6f0d5e59a94c builds before 1bec5698b55aa2be5c3b983dba657c01d0fd3dbc; from 2c66daecc4092e6049673c281b2e6f0d5e59a94c before 5a59bf70c38ee1eb4be03bab830bbc3a6f0bd1f1; from 2c66daecc4092e6049673c281b2e6f0d5e59a94c before 8d9d9bf3565271ca7ab9c716a94e87296177e7ba; from 2c66daecc4092e6049673c281b2e6f0d5e59a94c before cc024a3de265ef6c58957f4990eccb9f806208cb; and 1 more ranges | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
linux linux_kernel linux:linux_kernel | from 3.13 before 6.6.136; from 6.7 before 6.12.83; from 6.13 before 6.18.24; from 6.19 before 6.19.14; from 7.0 before 7.0.1 | NVD |
References
- https://git.kernel.org/stable/c/9ba6bb09e00b922d902f684f575779e5433fe6e3
- https://git.kernel.org/stable/c/f83b399aa05a0712e3b1569a30d3d90b3533d2ef
- https://git.kernel.org/stable/c/20663102c14566e900e1d2f679e30b7f1694f387
- https://git.kernel.org/stable/c/2819f34e08bdffb6f06a51c67948ec5737fb166apatch
- https://git.kernel.org/stable/c/1bec5698b55aa2be5c3b983dba657c01d0fd3dbcpatch
- https://git.kernel.org/stable/c/5a59bf70c38ee1eb4be03bab830bbc3a6f0bd1f1patch
- https://git.kernel.org/stable/c/8d9d9bf3565271ca7ab9c716a94e87296177e7bapatch
- https://git.kernel.org/stable/c/cc024a3de265ef6c58957f4990eccb9f806208cbpatch
- https://git.kernel.org/stable/c/46ce8be2ced389bccd84bcc04a12cf2f4d0c22d1patch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.