{"id":"CVE-2026-46111","summary":"Bluetooth: hci_conn: fix potential UAF in create_big_sync","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: fix potential UAF in create_big_sync\n\nAdd hci_conn_valid() check in create_big_sync() to detect stale\nconnections before proceeding with BIG creation. Handle the\nresulting -ECANCELED in create_big_complete() and re-validate the\nconnection under hci_dev_lock() before dereferencing, matching the\npattern used by create_le_conn_complete() and create_pa_complete().\n\nKeep the hci_conn object alive across the async boundary by taking\na reference via hci_conn_get() when queueing create_big_sync(), and\ndropping it in the completion callback. The refcount and the lock\nare complementary: the refcount keeps the object allocated, while\nhci_dev_lock() serializes hci_conn_hash_del()'s list_del_rcu() on\nhdev-\u003econn_hash, as required by hci_conn_del().\n\nhci_conn_put() is called outside hci_dev_unlock() so the final put\n(which resolves to kfree() via bt_link_release) does not run under\nhdev-\u003elock, though the release path would be safe either way.\n\nWithout this, create_big_complete() would unconditionally\ndereference the conn pointer on error, causing a use-after-free\nvia hci_connect_cfm() and hci_conn_del().","modified":"2026-07-08T08:13:36.890000853Z","published":"2026-05-28T09:35:19.970Z","related":["SUSE-SU-2026:22108-1","SUSE-SU-2026:22137-1","SUSE-SU-2026:22433-1","SUSE-SU-2026:22458-1","SUSE-SU-2026:2482-1","SUSE-SU-2026:2591-1","openSUSE-SU-2026:10954-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46111.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0beddb0c380bed5f5b8e61ddbe14635bb73d0b41"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1750a2df0eab61dc421a7afae74abdd239a44b85"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6823f730bf195fc296d9edd09e2ca94bc1ff5584"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dc34f8d8240f25dd137dc2758ebbcc75e3779142"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f8eaf92c57ad99358dd372580d5ff87623343a72"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46111.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46111"},{"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":"eca0ae4aea66914515e5e3098ea051b518ee5316"},{"fixed":"6823f730bf195fc296d9edd09e2ca94bc1ff5584"},{"fixed":"1750a2df0eab61dc421a7afae74abdd239a44b85"},{"fixed":"dc34f8d8240f25dd137dc2758ebbcc75e3779142"},{"fixed":"f8eaf92c57ad99358dd372580d5ff87623343a72"},{"fixed":"0beddb0c380bed5f5b8e61ddbe14635bb73d0b41"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46111.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.0.0"},{"fixed":"6.6.140"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.90"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.32"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.7"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46111.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}