Fix RCU Usage in rtw89_core_txq_push() in Kernel
Summary
GSD-2022-1001399: rtw89: fix RCU usage in rtw89_core_txq_push(). Affects Kernel versions < 6a2d29cb71d5d2e112a6f1cf479385135ede6384. No fix is published. How to fix ↓
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Background
The Kernel is a fundamental component of the Linux operating system that provides core functionalities and acts as an interface between the hardware and software layers. It manages system resources, facilitates communication between different software components, and ensures the overall stability and security of the system. The rtw89_core_txq_push() function is a part of the Kernel's Realtek 802.11ax wireless driver (rtw89) and is responsible for pushing packets to the transmission queue. However, this function has a vulnerability related to RCU (Read-Copy-Update) usage.
Vulnerability Detail
The vulnerability in rtw89_core_txq_push() arises from incorrect usage of RCU. RCU is a synchronization mechanism used in the Linux Kernel to allow efficient read access to shared data structures without blocking writers. In this case, the RCU usage in rtw89_core_txq_push() is flawed, potentially leading to race conditions and memory corruption. An attacker could exploit this vulnerability to cause a denial-of-service (DoS) condition or potentially execute arbitrary code with kernel-level privileges.
How To Fix
No fixed version is published for this vulnerability.
To fix this vulnerability, the Linux Kernel developers have addressed the issue in version v5.16.20 through commit 6a2d29cb71d5d2e112a6f1cf479385135ede6384. To resolve the vulnerability, users are advised to update their Kernel to this version or a later one that includes the fix.
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Workaround
As this vulnerability has been fixed in the Linux Kernel, there is no specific workaround available. Users are strongly recommended to update their Kernel to the fixed version.
Conclusion
The vulnerability in rtw89_core_txq_push() in the Kernel has been addressed in version v5.16.20 through commit 6a2d29cb71d5d2e112a6f1cf479385135ede6384. Users are strongly advised to update their Kernel to this version or a later one that includes the fix. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
This vulnerability could potentially allow an attacker to cause a denial-of-service (DoS) condition or execute arbitrary code with kernel-level privileges.
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 to the playground, and it will provide real-time alerts for open-source vulnerabilities, including this one.
Yes, the vulnerability has been fixed in the Linux Kernel version v5.16.20 through commit 6a2d29cb71d5d2e112a6f1cf479385135ede6384. Users are advised to update their Kernel to this version or a later one that includes the fix.
At the time of this report, there are no known exploits for this vulnerability. However, it is crucial to apply the fix promptly to mitigate any potential risks.
You can find more information about this vulnerability in the Linux Kernel's official repository. Please refer to the provided source link in the vulnerability details section.
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