CVE-2024-26801: Bluetooth: Avoid potential use-after-free in hci_error_reset

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-04-04 · updated 2026-08-04
Weakness: CWE-416

Description

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.

Affected products

Linux kernel: from 4.0 before 4.19.309; from 4.20 before 5.4.271; from 5.5 before 5.10.212; from 5.11 before 5.15.151; from 5.16 before 6.1.81; from 6.2 before 6.6.21 — fixed in 4.19.309, 5.10.212, 5.15.151, 5.4.271, 6.1.81, 6.6.21

How to fix

Upgrade to a fixed version: Linux kernel 4.19.309, 5.10.212, 5.15.151, 5.4.271. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2024-26801 or the next vulnerability affects your stack