{"id":"CVE-2026-98577","state":"PUBLISHED","title":"nfc: llcp: fix WKS SAP hijacking via prefix match in nfc_llcp_wks_sap()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: fix WKS SAP hijacking via prefix match in nfc_llcp_wks_sap()\n\nnfc_llcp_wks_sap() compares only service_name_len bytes, so a short\nservice_name like \"u\" matches longer WKS strings like \"urn:nfc:sn:snep\".\nFix by requiring exact length match before strncmp().","publishedAt":"2026-10-18T15:18:47.635Z","updatedAt":"2026-10-19T09:22:02.632Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"0c83a8a45fed256ccc5fe7160b436b671fc79fb8","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"aa555ed5ed0d15efbaf27e0e9f152a6df715278a","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"32b5f0b338bf59391a1cff9a6190a72c4d2c1ba8","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"6fad2c34d451d11a9f3f946cae1105fee91d96b8","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"bf41af8f910cbb5d776a1dfa0671d31a7e262e28","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"f234197f3bda3aea5d4b1e591d6bcb3660a8b3fc","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"0a0412745c86acd089c6460da715ab966b1615e7","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"408cff6bd60636df201274d320edfdfde9ed41db","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/llcp_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.3","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.55","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.9","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/llcp_core.c"]}],"references":["https://git.kernel.org/stable/c/0c83a8a45fed256ccc5fe7160b436b671fc79fb8","https://git.kernel.org/stable/c/aa555ed5ed0d15efbaf27e0e9f152a6df715278a","https://git.kernel.org/stable/c/32b5f0b338bf59391a1cff9a6190a72c4d2c1ba8","https://git.kernel.org/stable/c/6fad2c34d451d11a9f3f946cae1105fee91d96b8","https://git.kernel.org/stable/c/bf41af8f910cbb5d776a1dfa0671d31a7e262e28","https://git.kernel.org/stable/c/f234197f3bda3aea5d4b1e591d6bcb3660a8b3fc","https://git.kernel.org/stable/c/0a0412745c86acd089c6460da715ab966b1615e7","https://git.kernel.org/stable/c/408cff6bd60636df201274d320edfdfde9ed41db"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98577.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98577","state":"PUBLISHED","datePublished":"2026-10-18T15:18:47.635Z","dateUpdated":"2026-10-19T09:22:02.632Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.358Z"},"containers":{"cna":{"title":"nfc: llcp: fix WKS SAP hijacking via prefix match in nfc_llcp_wks_sap()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: fix WKS SAP hijacking via prefix match in nfc_llcp_wks_sap()\n\nnfc_llcp_wks_sap() compares only service_name_len bytes, so a short\nservice_name like \"u\" matches longer WKS strings like \"urn:nfc:sn:snep\".\nFix by requiring exact length match before strncmp()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"0c83a8a45fed256ccc5fe7160b436b671fc79fb8","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"aa555ed5ed0d15efbaf27e0e9f152a6df715278a","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"32b5f0b338bf59391a1cff9a6190a72c4d2c1ba8","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"6fad2c34d451d11a9f3f946cae1105fee91d96b8","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"bf41af8f910cbb5d776a1dfa0671d31a7e262e28","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"f234197f3bda3aea5d4b1e591d6bcb3660a8b3fc","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"0a0412745c86acd089c6460da715ab966b1615e7","versionType":"git"},{"version":"d646960f7986fefb460a2b062d5ccc8ccfeacc3a","status":"affected","lessThan":"408cff6bd60636df201274d320edfdfde9ed41db","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/llcp_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.3","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.55","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.9","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/llcp_core.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:22:02.632Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.18.55"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"7.2.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}