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CVE-2026-98577

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

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.21%Chance of exploitation activity in the next 30 days, higher than 10% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in0c83a8a45fed256ccc5fe7160b436b671fc79fb8Also 32b5f0b338bf59391a1cff9a6190a72c4d2c1ba8, 6fad2c34d451d11a9f3f946cae1105fee91d96b8 and 2 moreCVE List
Published18 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 0c83a8a45fed256ccc5fe7160b436b671fc79fb8LinuxCVE List
  • 32b5f0b338bf59391a1cff9a6190a72c4d2c1ba8LinuxCVE List
  • 6fad2c34d451d11a9f3f946cae1105fee91d96b8LinuxCVE List
  • 0a0412745c86acd089c6460da715ab966b1615e7LinuxCVE List
  • 408cff6bd60636df201274d320edfdfde9ed41dbLinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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().

Text from CVE List

Affected versions 18

  • Linuxaffected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a before 0c83a8a45fed256ccc5fe7160b436b671fc79fb8CVE List
  • Linuxaffected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a before aa555ed5ed0d15efbaf27e0e9f152a6df715278aCVE List
  • Linuxaffected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a before 32b5f0b338bf59391a1cff9a6190a72c4d2c1ba8CVE List
  • Linuxaffected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a before 6fad2c34d451d11a9f3f946cae1105fee91d96b8CVE List
  • Linuxaffected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a before bf41af8f910cbb5d776a1dfa0671d31a7e262e28CVE List
  • Linuxaffected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a before f234197f3bda3aea5d4b1e591d6bcb3660a8b3fcCVE List
  • Linuxaffected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a before 0a0412745c86acd089c6460da715ab966b1615e7CVE List
  • Linuxaffected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a before 408cff6bd60636df201274d320edfdfde9ed41dbCVE List
  • Linuxaffected: 3.3CVE List
  • Linuxunaffected: all versions before 3.3CVE List
  • Linuxunaffected: 5.10.271 through 5.10.*CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.112 through 6.12.*CVE List
  • Linuxunaffected: 6.18.55 through 6.18.*CVE List
  • Linuxunaffected: 7.2.9 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 8