Bluetooth cmtp: Fix File Refcount When cmtp_attach_device Fails
Summary
GSD-2021-1000635: Bluetooth: cmtp: fix file refcount when cmtp_attach_device fails. Affects Kernel versions < fe201316ac36c48fc3cb2891dfdc8ab68058734d. No fix is published. How to fix ↓
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Background
The Bluetooth cmtp package is a component of the Linux Kernel that provides support for the Cable Replacement Protocol (CMTP) over Bluetooth. CMTP allows devices to emulate a serial port over a Bluetooth connection, enabling data transfer between devices. This vulnerability affects the cmtp module in the Linux Kernel.
Vulnerability Detail
The vulnerability in the cmtp module occurs when the cmtp_attach_device function fails to properly handle file reference counting. This can lead to a file reference leak, potentially causing resource exhaustion and denial-of-service conditions. An attacker could exploit this vulnerability by repeatedly triggering the failure of cmtp_attach_device, resulting in the exhaustion of file resources and impacting the system's stability and performance. The vulnerability was fixed in Linux Kernel version v5.4.124 by commit fe201316ac36c48fc3cb2891dfdc8ab68058734d.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability. It is recommended to apply the fix by updating the Linux Kernel to the patched version.
Conclusion
The Bluetooth cmtp module in the Linux Kernel is vulnerable to a file reference leak when the cmtp_attach_device function fails. This can lead to resource exhaustion and denial-of-service conditions. Users should update their Linux Kernel to version v5.4.124 or later to fix this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
This vulnerability can lead to resource exhaustion and denial-of-service conditions, potentially impacting the stability and performance of the affected system.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and the Vulert Playground will analyze it for any known vulnerabilities.
Yes, a patch for this vulnerability is available in Linux Kernel version v5.4.124. Users are advised to update their Linux Kernel to this version or later.
There are no known exploits for this vulnerability at the time of this report. However, it is important to apply the patch as soon as possible to mitigate the risk.
The vulnerability was discovered by an automated security analysis tool and reported to the Linux Kernel development team.
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