ACK: [SRU][M][PATCH 0/1] CVE-2024-26801

[Stefan Bader]

On 23.04.24 23:27, Bethany Jamison wrote:
> [Impact]
> 
>   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.
> 
> [Fix]
> 
> Mantic:	Clean cherry-pick from linux-6.6.y
> Jammy:	fixed via stable team
> Focal:	pending
> Bionic:	fix sent to esm ML
> Xenial:	fix sent to esm ML
> Trusty:	not-affected
> 
> [Test Case]
> 
> Compile and boot tested.
> 
> [Where problems could occur]
> 
> This fix affects those who use bluetooth when HCI (host controller
> interface) is handling a connection error, an issue with this fix
> would be visable to the user via data corruption or even a system
> crash.
> 
> Ying Hsu (1):
>    Bluetooth: Avoid potential use-after-free in hci_error_reset
> 
>   net/bluetooth/hci_core.c | 7 ++++---
>   1 file changed, 4 insertions(+), 3 deletions(-)
> 

Acked-by: Stefan Bader <stefan.bader at canonical.com>
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