CVE-2026-98577 PUBLISHED

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

Assigner: Linux
Reserved: 25.09.2026 Published: 18.10.2026 Updated: 18.10.2026

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().

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from d646960f7986fefb460a2b062d5ccc8ccfeacc3a to 0c83a8a45fed256ccc5fe7160b436b671fc79fb8 (excl.)
  • affected from d646960f7986fefb460a2b062d5ccc8ccfeacc3a to aa555ed5ed0d15efbaf27e0e9f152a6df715278a (excl.)
  • affected from d646960f7986fefb460a2b062d5ccc8ccfeacc3a to 32b5f0b338bf59391a1cff9a6190a72c4d2c1ba8 (excl.)
  • affected from d646960f7986fefb460a2b062d5ccc8ccfeacc3a to 6fad2c34d451d11a9f3f946cae1105fee91d96b8 (excl.)
  • affected from d646960f7986fefb460a2b062d5ccc8ccfeacc3a to bf41af8f910cbb5d776a1dfa0671d31a7e262e28 (excl.)
  • affected from d646960f7986fefb460a2b062d5ccc8ccfeacc3a to f234197f3bda3aea5d4b1e591d6bcb3660a8b3fc (excl.)
  • affected from d646960f7986fefb460a2b062d5ccc8ccfeacc3a to 0a0412745c86acd089c6460da715ab966b1615e7 (excl.)
  • affected from d646960f7986fefb460a2b062d5ccc8ccfeacc3a to 408cff6bd60636df201274d320edfdfde9ed41db (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 3.3 is affected
  • unaffected from 0 to 3.3 (excl.)
  • unaffected from 5.10.271 to 5.10.* (incl.)
  • unaffected from 5.15.222 to 5.15.* (incl.)
  • unaffected from 6.1.189 to 6.1.* (incl.)
  • unaffected from 6.6.158 to 6.6.* (incl.)
  • unaffected from 6.12.112 to 6.12.* (incl.)
  • unaffected from 6.18.55 to 6.18.* (incl.)
  • unaffected from 7.2.9 to 7.2.* (incl.)
  • unaffected from 7.3-rc5 to * (incl.)

References