CVE-2026-31622

HIGH EPSS 19.9%
Published Apr 24, 20262mo ago · Modified Jun 17, 20261w ago
8.8 CVSS 3.1
High
Find Similar
Published Apr 24, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
8.8
Exploitability
2.8
Impact
5.9
Vector string
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Adjacent
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
19.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-120

Affected Products 5

VendorProductVersionRange
linuxlinux_kernel*≥3.13  –  <6.6.136
linuxlinux_kernel*≥6.7  –  <6.12.83
linuxlinux_kernel*≥6.13  –  <6.18.24
linuxlinux_kernel*≥6.19  –  <6.19.14
linuxlinux_kernel*≥7.0  –  <7.0.1

References 9

  • git.kernel.org https://git.kernel.org/stable/c/1bec5698b55aa2be5c3b983dba657c01d0fd3dbc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/20663102c14566e900e1d2f679e30b7f1694f387
  • git.kernel.org https://git.kernel.org/stable/c/2819f34e08bdffb6f06a51c67948ec5737fb166a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/46ce8be2ced389bccd84bcc04a12cf2f4d0c22d1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5a59bf70c38ee1eb4be03bab830bbc3a6f0bd1f1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8d9d9bf3565271ca7ab9c716a94e87296177e7ba
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9ba6bb09e00b922d902f684f575779e5433fe6e3
  • git.kernel.org https://git.kernel.org/stable/c/cc024a3de265ef6c58957f4990eccb9f806208cb
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f83b399aa05a0712e3b1569a30d3d90b3533d2ef

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/1bec5698b55aa2be5c3b983dba657c01d0fd3dbc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2819f34e08bdffb6f06a51c67948ec5737fb166a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/46ce8be2ced389bccd84bcc04a12cf2f4d0c22d1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5a59bf70c38ee1eb4be03bab830bbc3a6f0bd1f1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8d9d9bf3565271ca7ab9c716a94e87296177e7ba
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cc024a3de265ef6c58957f4990eccb9f806208cb
    Patch