{ "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" } } } }