Bug 2348179 (CVE-2022-49136)

Summary: CVE-2022-49136 kernel: Bluetooth: hci_sync: Fix queuing commands when HCI_UNREGISTER is set
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A vulnerability was found in the Linux kernel's Bluetooth subsystem in the `hci_cmd_sync_queue()` function. There was a missing check for whether the `HCI_UNREGISTER` flag had been set, meaning that commands were still sent even as the Bluetooth device was being unregistered. This issue could lead to a use-after-free scenario where the command is executed after the device structure is freed, potentially leading to a crash, arbitrary code execution, and system instability.
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Description OSIDB Bzimport 2025-02-26 03:20:21 UTC 
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.
Comment 1 Avinash Hanwate 2025-02-26 21:51:56 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022606-CVE-2022-49136-033c@gregkh/T