{"id":"CVE-2026-98580","revision":"56742d02c29b43e29b25fc2216190b22","records":[{"revision":"56742d02c29b43e29b25fc2216190b22","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98580","aliases":[],"title":"nfc: llcp: Fix race condition in accept_queue lifecycle","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: Fix race condition in accept_queue lifecycle\n\nIn nfc_llcp_socket_release(), sockets and listener accept queues are\nwalked under the local sockets rwlock and bh_lock_sock().  However,\nbh_lock_sock() does not synchronise against process-context lock_sock()\nheld by nfc_llcp_accept_dequeue() during accept().  Because\nsocket_release() does not check sock_owned_by_user(), both paths can\nconcurrently unlink and release the same child socket, resulting in\nuse-after-free or a NULL pointer dereference of child->parent in\nnfc_llcp_accept_unlink().\n\nFix this synchronisation race by having nfc_llcp_socket_release() use\nprocess-context lock_sock() instead of bh_lock_sock():\n\n1. Pop sockets from the local sockets list under the write lock using\n   nfc_llcp_sock_list_pop() so lock_sock() can be acquired without\n   holding the rwlock.\n\n2. Because lock_sock() can sleep, defer the final release of the\n   nfc_llcp_local structure to a workqueue (release_work).  This avoids\n   a sleeping-in-atomic bug when the last local reference is dropped\n   from softirq context.  Additionally, hold a single device reference\n   on local from registration until final destruction.\n\n3. In nfc_llcp_local_get(), use kref_get_unless_zero() to prevent\n   resurrecting a local object whose teardown has been scheduled.\n\n4. In llcp_sock_accept(), verify that the listener socket state is still\n   LLCP_LISTEN after waking from schedule_timeout() to prevent hangs if\n   the listener is closed concurrently.\n\n5. When unlinking unaccepted child sockets during listener release,\n   unlink them from local->sockets, call sock_orphan(), and drop their\n   initial sk_alloc creation reference via sock_put().\n\n6. Make nfc_llcp_accept_unlink() idempotent by guarding parent access with\n   a NULL check.","state":0,"publishedAt":"2026-10-18T15:18:53.819+00:00","modifiedAt":"2026-10-19T09:22:05.887+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.h\",\n                        \"net/nfc/llcp_core.c\",\n                        \"net/nfc/llcp_sock.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"50b78b2a6500d0e97c204c1b6c51df8c17358bbe\",\n                            \"lessThan\": \"54adcabb0f1deef1bdae5fc64779ed6d442721c9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"50b78b2a6500d0e97c204c1b6c51df8c17358bbe\",\n                            \"lessThan\": \"7c938aad5108382c6ad7453c4b5ee8ae3f3252ed\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"50b78b2a6500d0e97c204c1b6c51df8c17358bbe\",\n                            \"lessThan\": \"d2093a0981138876212bc5f473bdbfba0786e064\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"50b78b2a6500d0e97c204c1b6c51df8c17358bbe\",\n                            \"lessThan\": \"41256821762a7114906b178826d17098e2fa5992\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"50b78b2a6500d0e97c204c1b6c51df8c17358bbe\",\n                            \"lessThan\": \"53867f6acb1af7f12d6485fa8a2819318f89083b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"50b78b2a6500d0e97c204c1b6c51df8c17358bbe\",\n                            \"lessThan\": \"da8a07757383614a8380a0f7dd54749d2687b82e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"50b78b2a6500d0e97c204c1b6c51df8c17358bbe\",\n                            \"lessThan\": \"d5e1c92d09caed19f2988739695ce611a86ba6f8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"50b78b2a6500d0e97c204c1b6c51df8c17358bbe\",\n                            \"lessThan\": \"c3eef2f988a3db9690369d7cef9a3344dd9788d3\",\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.h\",\n                        \"net/nfc/llcp_core.c\",\n                        \"net/nfc/llcp_sock.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.7\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.112\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.55\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.9\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/54adcabb0f1deef1bdae5fc64779ed6d442721c9","https://git.kernel.org/stable/c/7c938aad5108382c6ad7453c4b5ee8ae3f3252ed","https://git.kernel.org/stable/c/d2093a0981138876212bc5f473bdbfba0786e064","https://git.kernel.org/stable/c/41256821762a7114906b178826d17098e2fa5992","https://git.kernel.org/stable/c/53867f6acb1af7f12d6485fa8a2819318f89083b","https://git.kernel.org/stable/c/da8a07757383614a8380a0f7dd54749d2687b82e","https://git.kernel.org/stable/c/d5e1c92d09caed19f2988739695ce611a86ba6f8","https://git.kernel.org/stable/c/c3eef2f988a3db9690369d7cef9a3344dd9788d3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98580","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98580","identifiers":["CVE-2026-98580"]},"retained":false,"historicalAffected":[]}],"coverage":[]}