---
id: CVE-2026-98577
title: 'nfc: llcp: fix WKS SAP hijacking via prefix match in nfc_llcp_wks_sap()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nfc: llcp: fix WKS SAP hijacking via prefix match in nfc_llcp_wks_sap()

  nfc_llcp_wks_sap() compares only service_name_len bytes, so a short
  service_name like "u" match…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a <
    0c83a8a45fed256ccc5fe7160b436b671fc79fb8
  - >-
    Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a <
    aa555ed5ed0d15efbaf27e0e9f152a6df715278a
  - >-
    Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a <
    32b5f0b338bf59391a1cff9a6190a72c4d2c1ba8
  - >-
    Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a <
    6fad2c34d451d11a9f3f946cae1105fee91d96b8
  - >-
    Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a <
    bf41af8f910cbb5d776a1dfa0671d31a7e262e28
  - >-
    Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a <
    f234197f3bda3aea5d4b1e591d6bcb3660a8b3fc
  - >-
    Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a <
    0a0412745c86acd089c6460da715ab966b1615e7
  - >-
    Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a <
    408cff6bd60636df201274d320edfdfde9ed41db
  - Linux 3.3
published: '2026-10-18'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T09:22:02.632Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98577'
references:
  - url: 'https://git.kernel.org/stable/c/0c83a8a45fed256ccc5fe7160b436b671fc79fb8'
  - url: 'https://git.kernel.org/stable/c/aa555ed5ed0d15efbaf27e0e9f152a6df715278a'
  - url: 'https://git.kernel.org/stable/c/32b5f0b338bf59391a1cff9a6190a72c4d2c1ba8'
  - url: 'https://git.kernel.org/stable/c/6fad2c34d451d11a9f3f946cae1105fee91d96b8'
  - url: 'https://git.kernel.org/stable/c/bf41af8f910cbb5d776a1dfa0671d31a7e262e28'
  - url: 'https://git.kernel.org/stable/c/f234197f3bda3aea5d4b1e591d6bcb3660a8b3fc'
  - url: 'https://git.kernel.org/stable/c/0a0412745c86acd089c6460da715ab966b1615e7'
  - url: 'https://git.kernel.org/stable/c/408cff6bd60636df201274d320edfdfde9ed41db'
tags:
  - cve.org
ingestedAt: '2026-10-18T15:45:12.256Z'
---

## Overview

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

nfc: llcp: fix WKS SAP hijacking via prefix match in nfc_llcp_wks_sap()

nfc_llcp_wks_sap() compares only service_name_len bytes, so a short
service_name like "u" matches longer WKS strings like "urn:nfc:sn:snep".
Fix by requiring exact length match before strncmp().

## Affected

- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 0c83a8a45fed256ccc5fe7160b436b671fc79fb8`
- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < aa555ed5ed0d15efbaf27e0e9f152a6df715278a`
- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 32b5f0b338bf59391a1cff9a6190a72c4d2c1ba8`
- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 6fad2c34d451d11a9f3f946cae1105fee91d96b8`
- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < bf41af8f910cbb5d776a1dfa0671d31a7e262e28`
- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < f234197f3bda3aea5d4b1e591d6bcb3660a8b3fc`
- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 0a0412745c86acd089c6460da715ab966b1615e7`
- `Linux >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a < 408cff6bd60636df201274d320edfdfde9ed41db`
- `Linux 3.3`

## Remediation

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