{"id":"CVE-2026-98577","title":"kernel: nfc: llcp: fix WKS SAP hijacking via prefix match in nfc_llcp_wks_sap() (CVE-2026-98577)","summary":"A flaw was found in the Linux kernel's Near Field Communication (NFC) subsystem. In the Logical Link Control Protocol (LLCP) implementation, the kernel validates service names using only the length of the provided name instead of verifying…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","cvssSource":"vendor","cwe":"CWE-1025","vendor":"Red Hat","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":"2026-10-20","sourceUpdated":"2026-10-20T03:44:53+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98577.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98577.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98577"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2554979"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98577"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98577"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98577.mbox"},{"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":["csaf","vex","red-hat","cve.org"],"epss":0.00216,"epssPercentile":0.12002,"ingestedAt":"2026-10-18T15:45:12.256Z","slug":"CVE-2026-98577","body":"## Overview\n\nA flaw was found in the Linux kernel's Near Field Communication (NFC) subsystem. In the Logical Link Control Protocol (LLCP) implementation, the kernel validates service names using only the length of the provided name instead of verifying an exact match. A local attacker could exploit this flaw by supplying a shortened service name to improperly bind to and hijack a Well-Known Service Access Point (WKS SAP). This issue could allow an attacker to intercept communications intended for legitimate NFC services or cause a denial of service.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98577.json)\n\n**kernel: nfc: llcp: fix WKS SAP hijacking via prefix match in nfc_llcp_wks_sap()** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-20.\n\nNot affected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nRefer to the advisory for fix availability.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":225771,"id":"CVE-2026-98577","ts":1792498448993,"field":"cvss","old":null,"new":"5.3"},{"seq":225770,"id":"CVE-2026-98577","ts":1792498448993,"field":"severity","old":"none","new":"medium"}]}