{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98580","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-25T10:25:14.358Z","datePublished":"2026-10-18T15:18:53.819Z","dateUpdated":"2026-10-19T09:22:05.887Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-10-19T09:22:05.887Z"},"descriptions":[{"lang":"en","value":"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/llcp.h","net/nfc/llcp_core.c","net/nfc/llcp_sock.c"],"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"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/llcp.h","net/nfc/llcp_core.c","net/nfc/llcp_sock.c"],"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"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"6.18.55"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"7.2.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"7.3"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/54adcabb0f1deef1bdae5fc64779ed6d442721c9"},{"url":"https://git.kernel.org/stable/c/7c938aad5108382c6ad7453c4b5ee8ae3f3252ed"},{"url":"https://git.kernel.org/stable/c/d2093a0981138876212bc5f473bdbfba0786e064"},{"url":"https://git.kernel.org/stable/c/41256821762a7114906b178826d17098e2fa5992"},{"url":"https://git.kernel.org/stable/c/53867f6acb1af7f12d6485fa8a2819318f89083b"},{"url":"https://git.kernel.org/stable/c/da8a07757383614a8380a0f7dd54749d2687b82e"},{"url":"https://git.kernel.org/stable/c/d5e1c92d09caed19f2988739695ce611a86ba6f8"},{"url":"https://git.kernel.org/stable/c/c3eef2f988a3db9690369d7cef9a3344dd9788d3"}],"title":"nfc: llcp: Fix race condition in accept_queue lifecycle","x_generator":{"engine":"bippy-1.2.0"}}}}