{"schema":"threatline.record/2","record":{"id":"CVE-2026-98580","aliases":[],"summary":"nfc: llcp: Fix race condition in accept_queue lifecycle","details":"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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98580","source_modified_at":"2026-10-19T09:22:05.887Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"50b78b2a6500d0e97c204c1b6c51df8c17358bbe","lessThan":"54adcabb0f1deef1bdae5fc64779ed6d442721c9","status":"affected","versionType":"git"},{"version":"50b78b2a6500d0e97c204c1b6c51df8c17358bbe","lessThan":"7c938aad5108382c6ad7453c4b5ee8ae3f3252ed","status":"affected","versionType":"git"},{"version":"50b78b2a6500d0e97c204c1b6c51df8c17358bbe","lessThan":"d2093a0981138876212bc5f473bdbfba0786e064","status":"affected","versionType":"git"},{"version":"50b78b2a6500d0e97c204c1b6c51df8c17358bbe","lessThan":"41256821762a7114906b178826d17098e2fa5992","status":"affected","versionType":"git"},{"version":"50b78b2a6500d0e97c204c1b6c51df8c17358bbe","lessThan":"53867f6acb1af7f12d6485fa8a2819318f89083b","status":"affected","versionType":"git"},{"version":"50b78b2a6500d0e97c204c1b6c51df8c17358bbe","lessThan":"da8a07757383614a8380a0f7dd54749d2687b82e","status":"affected","versionType":"git"},{"version":"50b78b2a6500d0e97c204c1b6c51df8c17358bbe","lessThan":"d5e1c92d09caed19f2988739695ce611a86ba6f8","status":"affected","versionType":"git"},{"version":"50b78b2a6500d0e97c204c1b6c51df8c17358bbe","lessThan":"c3eef2f988a3db9690369d7cef9a3344dd9788d3","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98580","source_modified_at":"2026-10-19T09:22:05.887Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"3.7","status":"affected"},{"version":"0","lessThan":"3.7","status":"unaffected","versionType":"semver"},{"version":"5.10.271","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.222","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.112","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.55","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.9","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98580","source_modified_at":"2026-10-19T09:22:05.887Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"54adcabb0f1deef1bdae5fc64779ed6d442721c9","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98580","source_modified_at":"2026-10-19T09:22:05.887Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"7c938aad5108382c6ad7453c4b5ee8ae3f3252ed","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98580","source_modified_at":"2026-10-19T09:22:05.887Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"41256821762a7114906b178826d17098e2fa5992","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98580","source_modified_at":"2026-10-19T09:22:05.887Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"53867f6acb1af7f12d6485fa8a2819318f89083b","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.0021,"percentile":0.10711,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:18:53.819Z","modified_at":"2026-10-19T09:22:05.887Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98580","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:22:05.887Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98580","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/54adcabb0f1deef1bdae5fc64779ed6d442721c9"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/7c938aad5108382c6ad7453c4b5ee8ae3f3252ed"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/d2093a0981138876212bc5f473bdbfba0786e064"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/41256821762a7114906b178826d17098e2fa5992"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/53867f6acb1af7f12d6485fa8a2819318f89083b"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/da8a07757383614a8380a0f7dd54749d2687b82e"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/d5e1c92d09caed19f2988739695ce611a86ba6f8"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/c3eef2f988a3db9690369d7cef9a3344dd9788d3"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:22:05.887Z","content_hash":"d5b3c9c71268e3818a95b28094d536d79dfd4e75e445914eaca33cde225da908"}}