--- id: CVE-2026-64433 title: 'Bluetooth: MGMT: Fix UAF of hci_conn_params in add_device_complete' summary: |- In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: Fix UAF of hci_conn_params in add_device_complete add_device_complete() runs from the hci_cmd_sync_work kworker, which holds only hci_req_sync_lock an… severity: none vendor: Linux product: Linux affected: - >- Linux >= 31492b8386e5a243df26ca4a9421f6b041f414d5 < caed4a96d55757c139a899744657c032b6186665 - >- Linux >= 28826a89fdfd49f3291980c2e68b8a7c5d55e199 < e4369e4e970f3fa4676b76be14c1d315c87f22b6 - >- Linux >= 1e2e3044c1bc64a64aa0eaf7c17f7832c26c9775 < b346efa825b5e4386f19bc63f81141652d496ec4 - >- Linux >= 1e2e3044c1bc64a64aa0eaf7c17f7832c26c9775 < 9531014c60c804e16099885d4a98aedcf31bce8d - >- Linux >= 1e2e3044c1bc64a64aa0eaf7c17f7832c26c9775 < fa85d985f614bc3feb343000f14a1072e99b0df1 - Linux 7e370545b8bdb54ed7f1ae485d6d24d3b62a0b53 - Linux >= 6.6.92 < 6.6.145 - Linux >= 6.12.30 < 6.12.96 - Linux >= 6.14.8 < 6.15 - Linux 6.15 ssvc: exploitation: none automatable: 'no' technicalImpact: partial timestamp: '2026-11-06T16:38:32.968033Z' published: '2026-07-25' updated: '2026-11-06' sourceUpdated: '2026-11-06T16:44:51.918Z' source: CVEORG sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-64433' references: - url: 'https://git.kernel.org/stable/c/caed4a96d55757c139a899744657c032b6186665' - url: 'https://git.kernel.org/stable/c/e4369e4e970f3fa4676b76be14c1d315c87f22b6' - url: 'https://git.kernel.org/stable/c/b346efa825b5e4386f19bc63f81141652d496ec4' - url: 'https://git.kernel.org/stable/c/9531014c60c804e16099885d4a98aedcf31bce8d' - url: 'https://git.kernel.org/stable/c/fa85d985f614bc3feb343000f14a1072e99b0df1' tags: - cve.org epss: 0.00125 epssPercentile: 0.0222 ingestedAt: '2026-11-06T16:57:43.182Z' --- ## Overview In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: Fix UAF of hci_conn_params in add_device_complete add_device_complete() runs from the hci_cmd_sync_work kworker, which holds only hci_req_sync_lock and *not* hci_dev_lock. It calls hci_conn_params_lookup() and then dereferences the returned object (params->flags) without taking hci_dev_lock: params = hci_conn_params_lookup(hdev, &cp->addr.bdaddr, le_addr_type(cp->addr.type)); ... device_flags_changed(NULL, hdev, &cp->addr.bdaddr, cp->addr.type, hdev->conn_flags, params ? params->flags : 0); hci_conn_params_lookup() walks hdev->le_conn_params and is documented to require hdev->lock. A concurrent MGMT_OP_REMOVE_DEVICE (remove_device()), which does run under hci_dev_lock, can call hci_conn_params_free() to list_del() and kfree() the very object the lookup returned, so the subsequent params->flags read touches freed memory [0]. Hold hci_dev_lock() across the hci_conn_params_lookup() and the read of params->flags (and the matching event emission) so the lookup result cannot be freed by a concurrent remove_device() before it is used, honouring the locking contract of hci_conn_params_lookup(). [0]: (trailing page/memory-state dump trimmed) BUG: KASAN: slab-use-after-free in add_device_complete+0x358/0x3d8 net/bluetooth/mgmt.c:7671 Read of size 1 at addr ffff000017ab26c1 by task kworker/u9:8/388 CPU: 1 UID: 0 PID: 388 Comm: kworker/u9:8 Not tainted 7.0.11 #20 PREEMPT Hardware name: linux,dummy-virt (DT) Workqueue: hci0 hci_cmd_sync_work Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xb4/0xd4 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x118/0x5d8 mm/kasan/report.c:482 kasan_report+0xb0/0xf4 mm/kasan/report.c:595 __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378 add_device_complete+0x358/0x3d8 net/bluetooth/mgmt.c:7671 hci_cmd_sync_work+0x14c/0x240 net/bluetooth/hci_sync.c:334 process_one_work+0x628/0xd38 kernel/workqueue.c:3289 process_scheduled_works kernel/workqueue.c:3372 [inline] worker_thread+0x7a8/0xac0 kernel/workqueue.c:3453 kthread+0x39c/0x444 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Allocated by task 3401: kasan_save_stack+0x3c/0x64 mm/kasan/common.c:57 kasan_save_track+0x20/0x3c mm/kasan/common.c:78 kasan_save_alloc_info+0x40/0x54 mm/kasan/generic.c:570 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0xd4/0xd8 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x1b0/0x458 mm/slub.c:5385 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] hci_conn_params_add+0x10c/0x4b0 net/bluetooth/hci_core.c:2279 hci_conn_params_set net/bluetooth/mgmt.c:5162 [inline] add_device+0x5b4/0xa54 net/bluetooth/mgmt.c:7755 hci_mgmt_cmd net/bluetooth/hci_sock.c:1721 [inline] hci_sock_sendmsg+0x10b4/0x1dd0 net/bluetooth/hci_sock.c:1841 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0xe0/0x128 net/socket.c:742 sock_write_iter+0x250/0x390 net/socket.c:1195 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x66c/0xab0 fs/read_write.c:688 ksys_write+0x1fc/0x24c fs/read_write.c:740 __do_sys_write fs/read_write.c:751 [inline] __se_sys_write fs/read_write.c:748 [inline] __arm64_sys_write+0x70/0xa4 fs/read_write.c:748 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x84/0x2a8 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xe4/0x294 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x44/0x5c arch/arm64/kernel/syscall.c:151 el0_svc+0x38/0xac arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Freed by task 3740: kasan_save_stack+0x3c/0x64 ---truncated--- ## Affected - `Linux >= 31492b8386e5a243df26ca4a9421f6b041f414d5 < caed4a96d55757c139a899744657c032b6186665` - `Linux >= 28826a89fdfd49f3291980c2e68b8a7c5d55e199 < e4369e4e970f3fa4676b76be14c1d315c87f22b6` - `Linux >= 1e2e3044c1bc64a64aa0eaf7c17f7832c26c9775 < b346efa825b5e4386f19bc63f81141652d496ec4` - `Linux >= 1e2e3044c1bc64a64aa0eaf7c17f7832c26c9775 < 9531014c60c804e16099885d4a98aedcf31bce8d` - `Linux >= 1e2e3044c1bc64a64aa0eaf7c17f7832c26c9775 < fa85d985f614bc3feb343000f14a1072e99b0df1` - `Linux 7e370545b8bdb54ed7f1ae485d6d24d3b62a0b53` - `Linux >= 6.6.92 < 6.6.145` - `Linux >= 6.12.30 < 6.12.96` - `Linux >= 6.14.8 < 6.15` - `Linux 6.15` ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges.