CVE-2024-50029

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_conn: Fix UAF in hci_enhanced_setup_sync

This checks if the ACL connection remains valid as it could be destroyed

while hci_enhanced_setup_sync is pending on cmd_sync leading to the

following trace:

BUG: KASAN: slab-use-after-free in hci_enhanced_setup_sync+0x91b/0xa60

Read of size 1 at addr ffff888002328ffd by task kworker/u5:2/37

CPU: 0 UID: 0 PID: 37 Comm: kworker/u5:2 Not tainted 6.11.0-rc6-01300-g810be445d8d6 #7099

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-2.fc40 04/01/2014

Workqueue: hci0 hci_cmd_sync_work

Call Trace:

<TASK>

dump_stack_lvl+0x5d/0x80

? hci_enhanced_setup_sync+0x91b/0xa60

print_report+0x152/0x4c0

? hci_enhanced_setup_sync+0x91b/0xa60

? __virt_addr_valid+0x1fa/0x420

? hci_enhanced_setup_sync+0x91b/0xa60

kasan_report+0xda/0x1b0

? hci_enhanced_setup_sync+0x91b/0xa60

hci_enhanced_setup_sync+0x91b/0xa60

? __pfx_hci_enhanced_setup_sync+0x10/0x10

? __pfx___mutex_lock+0x10/0x10

hci_cmd_sync_work+0x1c2/0x330

process_one_work+0x7d9/0x1360

? __pfx_lock_acquire+0x10/0x10

? __pfx_process_one_work+0x10/0x10

? assign_work+0x167/0x240

worker_thread+0x5b7/0xf60

? __kthread_parkme+0xac/0x1c0

? __pfx_worker_thread+0x10/0x10

? __pfx_worker_thread+0x10/0x10

kthread+0x293/0x360

? __pfx_kthread+0x10/0x10

ret_from_fork+0x2f/0x70

? __pfx_kthread+0x10/0x10

ret_from_fork_asm+0x1a/0x30

</TASK>

Allocated by task 34:

kasan_save_stack+0x30/0x50

kasan_save_track+0x14/0x30

__kasan_kmalloc+0x8f/0xa0

__hci_conn_add+0x187/0x17d0

hci_connect_sco+0x2e1/0xb90

sco_sock_connect+0x2a2/0xb80

__sys_connect+0x227/0x2a0

__x64_sys_connect+0x6d/0xb0

do_syscall_64+0x71/0x140

entry_SYSCALL_64_after_hwframe+0x76/0x7e

Freed by task 37:

kasan_save_stack+0x30/0x50

kasan_save_track+0x14/0x30

kasan_save_free_info+0x3b/0x60

__kasan_slab_free+0x101/0x160

kfree+0xd0/0x250

device_release+0x9a/0x210

kobject_put+0x151/0x280

hci_conn_del+0x448/0xbf0

hci_abort_conn_sync+0x46f/0x980

hci_cmd_sync_work+0x1c2/0x330

process_one_work+0x7d9/0x1360

worker_thread+0x5b7/0xf60

kthread+0x293/0x360

ret_from_fork+0x2f/0x70

ret_from_fork_asm+0x1a/0x30