High · published April 4, 2024
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: Avoid potential use-after-free in hci_error_reset
While handling the HCI_EV_HARDWARE_ERROR event, if the underlying
BT controller is not responding, the GPIO reset mechanism would
free the hci_dev and lead to a use-after-free in hci_error_reset.
Here's the call trace observed on a ChromeOS device with Intel AX201:
queue_work_on+0x3e/0x6c
__hci_cmd_sync_sk+0x2ee/0x4c0 [bluetooth <HASH:3b4a6>]
? init_wait_entry+0x31/0x31
__hci_cmd_sync+0x16/0x20 [bluetooth <HASH:3b4a 6>]
hci_error_reset+0x4f/0xa4 [bluetooth <HASH:3b4a 6>]
process_one_work+0x1d8/0x33f
worker_thread+0x21b/0x373
kthread+0x13a/0x152
? pr_cont_work+0x54/0x54
? kthread_blkcg+0x31/0x31
ret_from_fork+0x1f/0x30
This patch holds the reference count on the hci_dev while processing
a HCI_EV_HARDWARE_ERROR event to avoid potential crash.
| Product | Versions | Fixed in |
|---|---|---|
| linux/linux_kernel | ≥ 4.0, < 4.19.309 | 4.19.309 |
| linux/linux_kernel | ≥ 4.20, < 5.4.271 | 5.4.271 |
| linux/linux_kernel | ≥ 5.5, < 5.10.212 | 5.10.212 |
| linux/linux_kernel | ≥ 5.11, < 5.15.151 | 5.15.151 |
| linux/linux_kernel | ≥ 5.16, < 6.1.81 | 6.1.81 |
| linux/linux_kernel | ≥ 6.2, < 6.6.21 | 6.6.21 |
| linux/linux_kernel | ≥ 6.7, < 6.7.9 | 6.7.9 |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |