CVE-2025-39982

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> Bluetooth: hci_event: Fix UAF in hci_acl_create_conn_sync<br /> <br /> This fixes the following UFA in hci_acl_create_conn_sync where a<br /> connection still pending is command submission (conn-&gt;state == BT_OPEN)<br /> maybe freed, also since this also can happen with the likes of<br /> hci_le_create_conn_sync fix it as well:<br /> <br /> BUG: KASAN: slab-use-after-free in hci_acl_create_conn_sync+0x5ef/0x790 net/bluetooth/hci_sync.c:6861<br /> Write of size 2 at addr ffff88805ffcc038 by task kworker/u11:2/9541<br /> <br /> CPU: 1 UID: 0 PID: 9541 Comm: kworker/u11:2 Not tainted 6.16.0-rc7 #3 PREEMPT(full)<br /> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014<br /> Workqueue: hci3 hci_cmd_sync_work<br /> Call Trace:<br /> <br /> dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120<br /> print_address_description mm/kasan/report.c:378 [inline]<br /> print_report+0xca/0x230 mm/kasan/report.c:480<br /> kasan_report+0x118/0x150 mm/kasan/report.c:593<br /> hci_acl_create_conn_sync+0x5ef/0x790 net/bluetooth/hci_sync.c:6861<br /> hci_cmd_sync_work+0x210/0x3a0 net/bluetooth/hci_sync.c:332<br /> process_one_work kernel/workqueue.c:3238 [inline]<br /> process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321<br /> worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402<br /> kthread+0x70e/0x8a0 kernel/kthread.c:464<br /> ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148<br /> ret_from_fork_asm+0x1a/0x30 home/kwqcheii/source/fuzzing/kernel/kasan/linux-6.16-rc7/arch/x86/entry/entry_64.S:245<br /> <br /> <br /> Allocated by task 123736:<br /> kasan_save_stack mm/kasan/common.c:47 [inline]<br /> kasan_save_track+0x3e/0x80 mm/kasan/common.c:68<br /> poison_kmalloc_redzone mm/kasan/common.c:377 [inline]<br /> __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394<br /> kasan_kmalloc include/linux/kasan.h:260 [inline]<br /> __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4359<br /> kmalloc_noprof include/linux/slab.h:905 [inline]<br /> kzalloc_noprof include/linux/slab.h:1039 [inline]<br /> __hci_conn_add+0x233/0x1b30 net/bluetooth/hci_conn.c:939<br /> hci_conn_add_unset net/bluetooth/hci_conn.c:1051 [inline]<br /> hci_connect_acl+0x16c/0x4e0 net/bluetooth/hci_conn.c:1634<br /> pair_device+0x418/0xa70 net/bluetooth/mgmt.c:3556<br /> hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719<br /> hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839<br /> sock_sendmsg_nosec net/socket.c:712 [inline]<br /> __sock_sendmsg+0x219/0x270 net/socket.c:727<br /> sock_write_iter+0x258/0x330 net/socket.c:1131<br /> new_sync_write fs/read_write.c:593 [inline]<br /> vfs_write+0x54b/0xa90 fs/read_write.c:686<br /> ksys_write+0x145/0x250 fs/read_write.c:738<br /> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]<br /> do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> <br /> Freed by task 103680:<br /> kasan_save_stack mm/kasan/common.c:47 [inline]<br /> kasan_save_track+0x3e/0x80 mm/kasan/common.c:68<br /> kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576<br /> poison_slab_object mm/kasan/common.c:247 [inline]<br /> __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264<br /> kasan_slab_free include/linux/kasan.h:233 [inline]<br /> slab_free_hook mm/slub.c:2381 [inline]<br /> slab_free mm/slub.c:4643 [inline]<br /> kfree+0x18e/0x440 mm/slub.c:4842<br /> device_release+0x9c/0x1c0<br /> kobject_cleanup lib/kobject.c:689 [inline]<br /> kobject_release lib/kobject.c:720 [inline]<br /> kref_put include/linux/kref.h:65 [inline]<br /> kobject_put+0x22b/0x480 lib/kobject.c:737<br /> hci_conn_cleanup net/bluetooth/hci_conn.c:175 [inline]<br /> hci_conn_del+0x8ff/0xcb0 net/bluetooth/hci_conn.c:1173<br /> hci_conn_complete_evt+0x3c7/0x1040 net/bluetooth/hci_event.c:3199<br /> hci_event_func net/bluetooth/hci_event.c:7477 [inline]<br /> hci_event_packet+0x7e0/0x1200 net/bluetooth/hci_event.c:7531<br /> hci_rx_work+0x46a/0xe80 net/bluetooth/hci_core.c:4070<br /> process_one_work kernel/workqueue.c:3238 [inline]<br /> process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321<br /> worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402<br /> kthread+0x70e/0x8a0 kernel/kthread.c:464<br /> ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148<br /> ret_from_fork_asm+0x1a/0x30 home/kwqcheii/sour<br /> ---truncated---