{"id":"CVE-2026-90093","summary":"Bluetooth: L2CAP: access chan-\u003econn safely in get/setsockopt","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: access chan-\u003econn safely in get/setsockopt\n\nSince commit b66774b48dd9 (\"Bluetooth: L2CAP: Fix UAF in channel timeout by holding conn ref\")\nl2cap_chan::conn has held reference and remains non-NULL also after the\ncorresponding hci_conn is deleted.  In this state accessing various\nfields eg. hci_conn::hdev is invalid, which leads to KASAN crash in\nl2cap_sock_setsockopt() access of conn-\u003ehcon-\u003ehdev.\n\nCheck l2cap_chan::conn.hcon corresponds to an alive hci_conn before\ntrying to use it in l2cap_sock.c.  Hold l2cap_chan_lock() in\ngetsockopt/setsockopt to ensure it stays alive, and to avoid data races\nin l2cap_chan fields.","modified":"2026-11-13T04:07:06.334830956Z","published":"2026-09-17T16:06:06.843Z","related":["SUSE-SU-2026:24550-1","SUSE-SU-2026:24619-1","SUSE-SU-2026:24643-1","SUSE-SU-2026:24648-1","SUSE-SU-2026:24651-1","SUSE-SU-2026:24662-1","SUSE-SU-2026:5091-1","openSUSE-SU-2026:11880-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90093.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0d7b7b31ea092e17d757bd24e2e9028ba5e3a4ca"},{"type":"WEB","url":"https://git.kernel.org/stable/c/19e154d794eb4d33d99ca4a087b1cea9d5e65786"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3af72bf8f73c519ee562e6963d5ff8e678924f93"},{"type":"WEB","url":"https://git.kernel.org/stable/c/737b80c97aef10404a9beed7c0ed45fcd5fc5931"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8460dc49c9756a1e9288218060b4d41e1b704905"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c66cd500ba1a58b3798c468fcc774ed2c8c2ec7d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ca2c4c26498643f421d35ffe258fafbd3ed461c3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f49321c85785178214fd67f2e9b4b73d6363783b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90093.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90093"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8f90405a4a6f1f1880dc07996b47bf57c712bd8a"},{"fixed":"c66cd500ba1a58b3798c468fcc774ed2c8c2ec7d"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"32d783cafb46ff3ca58e6f9fd62c9c5f35eaf26b"},{"fixed":"737b80c97aef10404a9beed7c0ed45fcd5fc5931"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8922c7940bae9ce4b1736dddb6362370793835c2"},{"fixed":"0d7b7b31ea092e17d757bd24e2e9028ba5e3a4ca"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"91047a4396a8b1857a6f712a90cf33ec0012b189"},{"fixed":"19e154d794eb4d33d99ca4a087b1cea9d5e65786"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0b0e2bf39cf99e458d991b9df253727e036a7d7d"},{"fixed":"3af72bf8f73c519ee562e6963d5ff8e678924f93"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d3b739db5dc6f688a60d56da872fabaf65246032"},{"fixed":"8460dc49c9756a1e9288218060b4d41e1b704905"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b66774b48dd98f07254951f74ea6f513efe7ff8b"},{"fixed":"f49321c85785178214fd67f2e9b4b73d6363783b"},{"fixed":"ca2c4c26498643f421d35ffe258fafbd3ed461c3"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"50c38d9f42a529691e4e67ea9cedf4f0bfc8d277"}]}],"versions":["v5.10.272","v5.10.271","v5.10.270","v5.10.269","v5.10.268","v5.10.267","v5.10.266","v5.10.265","v5.15.223","v5.15.222","v5.15.221","v5.15.220","v5.15.219","v5.15.218","v5.15.217","v5.15.216","v6.1.190","v6.1.189","v6.1.188","v6.1.187","v6.1.186","v6.1.185","v6.1.184","v6.1.183","v6.6.159","v6.6.158","v6.6.157","v6.6.156","v6.6.155","v6.6.154","v6.6.153","v6.6.152","v6.6.151","v6.6.150","v6.6.149","v6.6.148","v6.6.147","v6.6.146","v6.6.145","v6.12.113","v6.12.112","v6.12.111","v6.12.110","v6.12.109","v6.12.108","v6.12.107","v6.12.106","v6.12.105","v6.12.104","v6.12.103","v6.12.102","v6.12.101","v6.12.100","v6.12.99","v6.12.98","v6.12.97","v6.18.56","v6.18.55","v6.18.54","v6.18.53","v6.18.52","v6.18.51","v6.18.50","v6.18.49","v6.18.48","v6.18.47","v6.18.46","v6.18.45","v6.18.44","v6.18.43","v6.18.42","v6.18.41","v6.18.40","v6.18.39","v7.1.13","v7.1.12","v7.1.11","v7.1.10","v7.1.9","v7.1.8","v7.1.7","v7.1.6","v7.1.5","v7.1.4"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-90093.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.10.265"},{"fixed":"5.10.273"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.15.216"},{"fixed":"5.15.224"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.1.183"},{"fixed":"6.1.191"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.6.145"},{"fixed":"6.6.160"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.12.97"},{"fixed":"6.12.114"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.18.39"},{"fixed":"6.18.57"}]},{"type":"ECOSYSTEM","events":[{"introduced":"7.1.4"},{"fixed":"7.2"}]},{"type":"ECOSYSTEM","events":[{"introduced":"7.2.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"h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