CVE-2025-40309

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

Bluetooth: SCO: Fix UAF on sco_conn_free

BUG: KASAN: slab-use-after-free in sco_conn_free net/bluetooth/sco.c:87 [inline]

BUG: KASAN: slab-use-after-free in kref_put include/linux/kref.h:65 [inline]

BUG: KASAN: slab-use-after-free in sco_conn_put+0xdd/0x410

net/bluetooth/sco.c:107

Write of size 8 at addr ffff88811cb96b50 by task kworker/u17:4/352

CPU: 1 UID: 0 PID: 352 Comm: kworker/u17:4 Not tainted

6.17.0-rc5-g717368f83676 #4 PREEMPT(voluntary)

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014

Workqueue: hci13 hci_cmd_sync_work

Call Trace:

<TASK>

__dump_stack lib/dump_stack.c:94 [inline]

dump_stack_lvl+0x10b/0x170 lib/dump_stack.c:120

print_address_description mm/kasan/report.c:378 [inline]

print_report+0x191/0x550 mm/kasan/report.c:482

kasan_report+0xc4/0x100 mm/kasan/report.c:595

sco_conn_free net/bluetooth/sco.c:87 [inline]

kref_put include/linux/kref.h:65 [inline]

sco_conn_put+0xdd/0x410 net/bluetooth/sco.c:107

sco_connect_cfm+0xb4/0xae0 net/bluetooth/sco.c:1441

hci_connect_cfm include/net/bluetooth/hci_core.h:2082 [inline]

hci_conn_failed+0x20a/0x2e0 net/bluetooth/hci_conn.c:1313

hci_conn_unlink+0x55f/0x810 net/bluetooth/hci_conn.c:1121

hci_conn_del+0xb6/0x1110 net/bluetooth/hci_conn.c:1147

hci_abort_conn_sync+0x8c5/0xbb0 net/bluetooth/hci_sync.c:5689

hci_cmd_sync_work+0x281/0x380 net/bluetooth/hci_sync.c:332

process_one_work kernel/workqueue.c:3236 [inline]

process_scheduled_works+0x77e/0x1040 kernel/workqueue.c:3319

worker_thread+0xbee/0x1200 kernel/workqueue.c:3400

kthread+0x3c7/0x870 kernel/kthread.c:463

ret_from_fork+0x13a/0x1e0 arch/x86/kernel/process.c:148

ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

</TASK>

Allocated by task 31370:

kasan_save_stack mm/kasan/common.c:47 [inline]

kasan_save_track+0x30/0x70 mm/kasan/common.c:68

poison_kmalloc_redzone mm/kasan/common.c:388 [inline]

__kasan_kmalloc+0x82/0x90 mm/kasan/common.c:405

kasan_kmalloc include/linux/kasan.h:260 [inline]

__do_kmalloc_node mm/slub.c:4382 [inline]

__kmalloc_noprof+0x22f/0x390 mm/slub.c:4394

kmalloc_noprof include/linux/slab.h:909 [inline]

sk_prot_alloc+0xae/0x220 net/core/sock.c:2239

sk_alloc+0x34/0x5a0 net/core/sock.c:2295

bt_sock_alloc+0x3c/0x330 net/bluetooth/af_bluetooth.c:151

sco_sock_alloc net/bluetooth/sco.c:562 [inline]

sco_sock_create+0xc0/0x350 net/bluetooth/sco.c:593

bt_sock_create+0x161/0x3b0 net/bluetooth/af_bluetooth.c:135

__sock_create+0x3ad/0x780 net/socket.c:1589

sock_create net/socket.c:1647 [inline]

__sys_socket_create net/socket.c:1684 [inline]

__sys_socket+0xd5/0x330 net/socket.c:1731

__do_sys_socket net/socket.c:1745 [inline]

__se_sys_socket net/socket.c:1743 [inline]

__x64_sys_socket+0x7a/0x90 net/socket.c:1743

do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]

do_syscall_64+0xc7/0x240 arch/x86/entry/syscall_64.c:94

entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 31374:

kasan_save_stack mm/kasan/common.c:47 [inline]

kasan_save_track+0x30/0x70 mm/kasan/common.c:68

kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576

poison_slab_object mm/kasan/common.c:243 [inline]

__kasan_slab_free+0x3d/0x50 mm/kasan/common.c:275

kasan_slab_free include/linux/kasan.h:233 [inline]

slab_free_hook mm/slub.c:2428 [inline]

slab_free mm/slub.c:4701 [inline]

kfree+0x199/0x3b0 mm/slub.c:4900

sk_prot_free net/core/sock.c:2278 [inline]

__sk_destruct+0x4aa/0x630 net/core/sock.c:2373

sco_sock_release+0x2ad/0x300 net/bluetooth/sco.c:1333

__sock_release net/socket.c:649 [inline]

sock_close+0xb8/0x230 net/socket.c:1439

__fput+0x3d1/0x9e0 fs/file_table.c:468

task_work_run+0x206/0x2a0 kernel/task_work.c:227

get_signal+0x1201/0x1410 kernel/signal.c:2807

arch_do_signal_or_restart+0x34/0x740 arch/x86/kernel/signal.c:337

exit_to_user_mode_loop+0x68/0xc0 kernel/entry/common.c:40

exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]

s

---truncated---