{"id":"CVE-2026-31629","revision":"740ecb6cff8045a88e99a50f495fe0da","records":[{"revision":"740ecb6cff8045a88e99a50f495fe0da","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-31629","aliases":[],"title":"nfc: llcp: add missing return after LLCP_CLOSED checks","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: add missing return after LLCP_CLOSED checks\n\nIn nfc_llcp_recv_hdlc() and nfc_llcp_recv_disc(), when the socket\nstate is LLCP_CLOSED, the code correctly calls release_sock() and\nnfc_llcp_sock_put() but fails to return. Execution falls through to\nthe remainder of the function, which calls release_sock() and\nnfc_llcp_sock_put() again. This results in a double release_sock()\nand a refcount underflow via double nfc_llcp_sock_put(), leading to\na use-after-free.\n\nAdd the missing return statements after the LLCP_CLOSED branches\nin both functions to prevent the fall-through.","state":0,"publishedAt":"2026-04-24T14:42:49.849+00:00","modifiedAt":"2026-10-15T01:17:21.139+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/nfc/llcp_core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\n                            \"lessThan\": \"b2a23529593d011fb433a3d711fc597ed6a6bd2f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\n                            \"lessThan\": \"665315df9c3486cb213fc44d83cc8bcd47fe0d26\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\n                            \"lessThan\": \"9b49e2a4b8219a2fc5cebf94f4ec34e509aff8a6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\n                            \"lessThan\": \"0eb1263a3b8c36418c9ba295c9ab3abed664edbf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\n                            \"lessThan\": \"796e0cac058252d0ad34ebe288e6f7979b5fc9b2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\n                            \"lessThan\": \"8977fad2b3c6eefd414131168d597c5d1d5e1abf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\n                            \"lessThan\": \"ff3d9e8f7244293e303f7b6ef70774291c7c27e9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\n                            \"lessThan\": \"aba4712e8f0381cd5d196534ce2ad082626a5ab6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d646960f7986fefb460a2b062d5ccc8ccfeacc3a\",\n                            \"lessThan\": \"2b5dd4632966c39da6ba74dbc8689b309065e82c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/nfc/llcp_core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.3\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.3\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.258\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.209\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.175\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.136\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.83\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.24\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.14\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.1\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/b2a23529593d011fb433a3d711fc597ed6a6bd2f","https://git.kernel.org/stable/c/665315df9c3486cb213fc44d83cc8bcd47fe0d26","https://git.kernel.org/stable/c/9b49e2a4b8219a2fc5cebf94f4ec34e509aff8a6","https://git.kernel.org/stable/c/0eb1263a3b8c36418c9ba295c9ab3abed664edbf","https://git.kernel.org/stable/c/796e0cac058252d0ad34ebe288e6f7979b5fc9b2","https://git.kernel.org/stable/c/8977fad2b3c6eefd414131168d597c5d1d5e1abf","https://git.kernel.org/stable/c/ff3d9e8f7244293e303f7b6ef70774291c7c27e9","https://git.kernel.org/stable/c/aba4712e8f0381cd5d196534ce2ad082626a5ab6","https://git.kernel.org/stable/c/2b5dd4632966c39da6ba74dbc8689b309065e82c"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31629","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-31629","identifiers":["CVE-2026-31629"]},"retained":false,"historicalAffected":[]}],"coverage":[]}