---
id: CVE-2026-98481
title: 'nfc: port100: reject frames whose declared length exceeds the received data'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nfc: port100: reject frames whose declared length exceeds the received data

  port100_recv_response() passes the URB transfer buffer to
  port100_rx_frame_is_valid(), whic…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 <
    0d482995f0cdd0302450aa300c684c642d8ab31f
  - >-
    Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 <
    9e8df087826b9999d1b83b06f5d85675d5a69c9e
  - >-
    Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 <
    db66a30588630c7de30ef033f00daddef69f6ad9
  - >-
    Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 <
    144ad477c381e2c592b64898d04ab4ce03b32861
  - >-
    Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 <
    e4da1452e10c6472a4bac48dc2f6a35fff1fcd69
  - >-
    Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 <
    14b1467cfc6630583650f33538174c5a1ec685ab
  - >-
    Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 <
    035056e07ea65be670284246d9bc62f2f00ff4a3
  - >-
    Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 <
    092c6a605cbd6414ef499834c2e0da69c2c3388e
  - Linux 3.13
published: '2026-10-18'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T15:15:55.360Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98481'
references:
  - url: 'https://git.kernel.org/stable/c/0d482995f0cdd0302450aa300c684c642d8ab31f'
  - url: 'https://git.kernel.org/stable/c/9e8df087826b9999d1b83b06f5d85675d5a69c9e'
  - url: 'https://git.kernel.org/stable/c/db66a30588630c7de30ef033f00daddef69f6ad9'
  - url: 'https://git.kernel.org/stable/c/144ad477c381e2c592b64898d04ab4ce03b32861'
  - url: 'https://git.kernel.org/stable/c/e4da1452e10c6472a4bac48dc2f6a35fff1fcd69'
  - url: 'https://git.kernel.org/stable/c/14b1467cfc6630583650f33538174c5a1ec685ab'
  - url: 'https://git.kernel.org/stable/c/035056e07ea65be670284246d9bc62f2f00ff4a3'
  - url: 'https://git.kernel.org/stable/c/092c6a605cbd6414ef499834c2e0da69c2c3388e'
tags:
  - cve.org
ingestedAt: '2026-10-18T15:45:12.296Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

nfc: port100: reject frames whose declared length exceeds the received data

port100_recv_response() passes the URB transfer buffer to
port100_rx_frame_is_valid(), which checksums le16_to_cpu(frame->datalen)
bytes of frame->data. datalen is a 16-bit field supplied by the device
and is never checked against the number of bytes actually received
(urb->actual_length), so a device reporting a datalen larger than the
received frame makes port100_data_checksum() read out of bounds past the
transfer buffer.

Reject a response whose declared frame size does not fit the received
length before validating it.

Found by 0sec (https://0sec.ai) using automated source analysis; the
missing bound is evident from source. Compile-tested.

## Affected

- `Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 < 0d482995f0cdd0302450aa300c684c642d8ab31f`
- `Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 < 9e8df087826b9999d1b83b06f5d85675d5a69c9e`
- `Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 < db66a30588630c7de30ef033f00daddef69f6ad9`
- `Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 < 144ad477c381e2c592b64898d04ab4ce03b32861`
- `Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 < e4da1452e10c6472a4bac48dc2f6a35fff1fcd69`
- `Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 < 14b1467cfc6630583650f33538174c5a1ec685ab`
- `Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 < 035056e07ea65be670284246d9bc62f2f00ff4a3`
- `Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 < 092c6a605cbd6414ef499834c2e0da69c2c3388e`
- `Linux 3.13`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.