CVE-2022-49136: Bluetooth: hci_sync: Fix queuing commands when HCI_UNREGISTER is set

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-02-26 · updated 2026-06-17
Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Fix queuing commands when HCI_UNREGISTER is set hci_cmd_sync_queue shall return an error if HCI_UNREGISTER flag has been set as that means hci_unregister_dev has been called so it will likely cause a uaf after the timeout as the hdev will be freed.

Affected products

Linux kernel: from 5.17 before 5.17.3 — fixed in 5.17.3

How to fix

Upgrade to a fixed version: Linux kernel 5.17.3. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/0b94f2651f56b9e4aa5f012b0d7eb57308c773cf
https://git.kernel.org/stable/c/1c69ef84a808676cceb69210addf5df45b741323

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