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🛡️ CVE-2026-31622 — kernel

🟠 CVSS 8.8 — High ✅ No Known Exploit NVD
8.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

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.

How this vulnerability can be exploited

This issue can be reached from an adjacent network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software

CVE-2026-31622 is recorded against 2 packages.

  • kernel (from 6.20.0 up to 7.0.1)
  • linux-kernel (from 7.0 up to 7.0.1)

Timeline and source

Published on 24 April 2026 and last revised on 15 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-31622 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 8.8
CVSS Vector CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-04-24
Updated 2026-08-20
Modified 2026-08-15

Affected Packages

Software From version Fixed in
kernel 6.20.0 7.0.1
linux-kernel 7.0 7.0.1

References

Similar Threats

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