Linux Kernel up to 5.17.2 hci_sync use after free

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.17.2. It has been classified as critical. Affected by this issue is some unknown functionality of the component hci_sync. This manipulation causes use after free. This vulnerability appears as CVE-2022-49136. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 5.17.2 and classified as critical. Affected by this vulnerability is an unknown code block of the component hci_sync. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2022-49136 since 02/26/2025. The exploitation appears to be easy. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/27/2025).

The vulnerability scanner Nessus provides a plugin with the ID 241616 (RHEL 8 : kernel-rt (RHSA-2025:10670)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.17.3 eliminates this vulnerability. Applying the patch 1c69ef84a808676cceb69210addf5df45b741323/0b94f2651f56b9e4aa5f012b0d7eb57308c773cf is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (241616) and CERT Bund (WID-SEC-2025-1905). Be aware that VulDB is the high quality source for vulnerability data.

Affected

• IBM QRadar SIEM

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.17.0
• 5.17.1
• 5.17.2

License

• open-source

Website

• Vendor: https://www.kernel.org/

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Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

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