{"api_version":"1","generated_at":"2026-07-23T15:33:51+00:00","cve":"CVE-2026-31629","urls":{"html":"https://cve.report/CVE-2026-31629","api":"https://cve.report/api/cve/CVE-2026-31629.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31629","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31629"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-04-24 15:16:42","updated_at":"2026-06-01 17:16:53"},"problem_types":["CWE-667"],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/aba4712e8f0381cd5d196534ce2ad082626a5ab6","name":"https://git.kernel.org/stable/c/aba4712e8f0381cd5d196534ce2ad082626a5ab6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/665315df9c3486cb213fc44d83cc8bcd47fe0d26","name":"https://git.kernel.org/stable/c/665315df9c3486cb213fc44d83cc8bcd47fe0d26","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/796e0cac058252d0ad34ebe288e6f7979b5fc9b2","name":"https://git.kernel.org/stable/c/796e0cac058252d0ad34ebe288e6f7979b5fc9b2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0eb1263a3b8c36418c9ba295c9ab3abed664edbf","name":"https://git.kernel.org/stable/c/0eb1263a3b8c36418c9ba295c9ab3abed664edbf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8977fad2b3c6eefd414131168d597c5d1d5e1abf","name":"https://git.kernel.org/stable/c/8977fad2b3c6eefd414131168d597c5d1d5e1abf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ff3d9e8f7244293e303f7b6ef70774291c7c27e9","name":"https://git.kernel.org/stable/c/ff3d9e8f7244293e303f7b6ef70774291c7c27e9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9b49e2a4b8219a2fc5cebf94f4ec34e509aff8a6","name":"https://git.kernel.org/stable/c/9b49e2a4b8219a2fc5cebf94f4ec34e509aff8a6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2b5dd4632966c39da6ba74dbc8689b309065e82c","name":"https://git.kernel.org/stable/c/2b5dd4632966c39da6ba74dbc8689b309065e82c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b2a23529593d011fb433a3d711fc597ed6a6bd2f","name":"https://git.kernel.org/stable/c/b2a23529593d011fb433a3d711fc597ed6a6bd2f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31629","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31629","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a b2a23529593d011fb433a3d711fc597ed6a6bd2f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a 665315df9c3486cb213fc44d83cc8bcd47fe0d26 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a 9b49e2a4b8219a2fc5cebf94f4ec34e509aff8a6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a 0eb1263a3b8c36418c9ba295c9ab3abed664edbf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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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."}],"metrics":[{"cvssV3_1":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-06-01T16:13:01.167Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/b2a23529593d011fb433a3d711fc597ed6a6bd2f"},{"url":"https://git.kernel.org/stable/c/665315df9c3486cb213fc44d83cc8bcd47fe0d26"},{"url":"https://git.kernel.org/stable/c/9b49e2a4b8219a2fc5cebf94f4ec34e509aff8a6"},{"url":"https://git.kernel.org/stable/c/0eb1263a3b8c36418c9ba295c9ab3abed664edbf"},{"url":"https://git.kernel.org/stable/c/796e0cac058252d0ad34ebe288e6f7979b5fc9b2"},{"url":"https://git.kernel.org/stable/c/8977fad2b3c6eefd414131168d597c5d1d5e1abf"},{"url":"https://git.kernel.org/stable/c/ff3d9e8f7244293e303f7b6ef70774291c7c27e9"},{"url":"https://git.kernel.org/stable/c/aba4712e8f0381cd5d196534ce2ad082626a5ab6"},{"url":"https://git.kernel.org/stable/c/2b5dd4632966c39da6ba74dbc8689b309065e82c"}],"title":"nfc: llcp: add missing return after LLCP_CLOSED checks","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-31629","datePublished":"2026-04-24T14:42:49.849Z","dateReserved":"2026-03-09T15:48:24.124Z","dateUpdated":"2026-06-01T16:13:01.167Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-04-24 15:16:42","lastModifiedDate":"2026-06-01 17:16:53","problem_types":["CWE-667"],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.6.136","matchCriteriaId":"FAB12062-558C-4570-A908-D71195858ADA"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.12.83","matchCriteriaId":"7F0AE5B5-23AC-4DCC-B37A-51CA1DAE7BA8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.18.24","matchCriteriaId":"8126B8B8-6D0B-4443-86C1-672AEE893555"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"6.19.14","matchCriteriaId":"D6A8A074-BBF4-4803-ABED-519A839435BB"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0","versionEndExcluding":"7.0.1","matchCriteriaId":"9B5888AB-7403-4335-89E4-21CC0B48366A"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"31629","Ordinal":"1","Title":"nfc: llcp: add missing return after LLCP_CLOSED checks","CVE":"CVE-2026-31629","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31629","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"nfc: llcp: add missing return after LLCP_CLOSED checks"}]}}}