Deadlock Vulnerability in Bluetooth Package
Summary
UVI-2021-1000366: Bluetooth: avoid deadlock between hci_dev->lock and socket lock. Affects Kernel versions >= eab2404ba798a8efda2a970f44071c3406d94e57, < 7cc0ba67883c6c8d3bddb283f56c167fc837a555. No fix is published. How to fix ↓
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Background
The Bluetooth package is a component of the Linux Kernel, which is responsible for managing Bluetooth devices and communication. It provides the necessary drivers and protocols for Bluetooth functionality on Linux systems. The package allows users to connect and interact with various Bluetooth devices, such as headphones, keyboards, and speakers. However, a vulnerability has been discovered in the Bluetooth package that can lead to a deadlock situation between the hci_dev->lock and socket lock.
Vulnerability Detail
The identified vulnerability in the Bluetooth package can result in a deadlock scenario between the hci_dev->lock and socket lock. This deadlock can occur when multiple threads or processes attempt to acquire these locks simultaneously, leading to a system freeze or unresponsiveness. The vulnerability was introduced in version v5.7 of the Linux Kernel and was fixed in version v5.10.37. The impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can avoid triggering the deadlock situation by minimizing concurrent access to the Bluetooth package. This can be achieved by limiting the number of processes or threads that interact with Bluetooth devices simultaneously. Additionally, ensuring proper synchronization and locking mechanisms in applications that utilize Bluetooth functionality can help mitigate the risk of encountering the deadlock.
Conclusion
The identified deadlock vulnerability in the Bluetooth package of the Linux Kernel can lead to system freezes or unresponsiveness. It is crucial to update the Linux Kernel to version v5.10.37 or later to address this vulnerability. Minimizing concurrent access to the Bluetooth package and ensuring proper synchronization in applications can also help mitigate the risk. For further assistance and guidance on vulnerability remediation, please contact DevNack.com.
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FAQ
The impact of this vulnerability can result in system freezes or unresponsiveness, potentially leading to a denial-of-service (DoS) situation. However, the actual impact and attack plausibility have not been proven yet.
You can use the Vulert Playground at Vulert Scanner to check if your system is affected by this vulnerability. Vulert monitors and alerts in real-time for open-source vulnerabilities without requiring access to the code or installation. Simply upload your manifest file, such as package-lock.json, to the Vulert Playground for analysis.
While updating the Linux Kernel is the recommended solution, you can mitigate the risk of encountering the deadlock by minimizing concurrent access to the Bluetooth package. Limiting the number of processes or threads interacting with Bluetooth devices simultaneously and ensuring proper synchronization in applications can help reduce the likelihood of triggering the deadlock.
As of now, there is no known exploit for this vulnerability. However, it is essential to apply the recommended updates and security patches to mitigate potential risks.
For more details about this vulnerability, you can refer to the source link provided in the database_specific section of the vulnerability details. Additionally, you can reach out to info@devnack.com for further support on vulnerability remediation.
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