NPD bug in sl_tx_timeout() in Linux Kernel
Summary
GSD-2022-1002289: drivers: net: slip: fix NPD bug in sl_tx_timeout(). Affects Kernel versions < 753b9d220a7d36dac70e7c6d05492d10d6f9dd36. No fix is published. How to fix ↓
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Background
The Linux Kernel is a widely used open-source operating system kernel that serves as the foundation for various Linux distributions. It provides essential functionality for hardware abstraction, process management, memory management, and device drivers. The slip driver in the kernel is responsible for handling Serial Line Internet Protocol (SLIP) connections. SLIP is a simple protocol used for encapsulating IP packets over serial connections. However, a vulnerability has been discovered in the slip driver's sl_tx_timeout() function, which could lead to a null pointer dereference (NPD) bug.
Vulnerability Detail
The vulnerability in the sl_tx_timeout() function of the slip driver in the Linux Kernel allows for a null pointer dereference (NPD) bug. This bug can be triggered when a timeout occurs during the transmission of SLIP packets. An attacker could potentially exploit this vulnerability to cause a denial-of-service (DoS) condition or execute arbitrary code with kernel privileges. 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 temporary workaround, users can disable the slip driver module if it is not required for their system. This can be done by blacklisting the slip module in the kernel configuration or by preventing it from loading at boot time. However, this workaround should only be considered if the slip driver is not essential for the system's functionality.
Conclusion
The NPD bug in the sl_tx_timeout() function of the slip driver in the Linux Kernel can be mitigated by updating to version v4.19.239 or later. Users should apply the necessary updates to ensure the security and stability of their systems. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The slip driver in the Linux Kernel is responsible for handling Serial Line Internet Protocol (SLIP) connections. SLIP is a simple protocol used for encapsulating IP packets over serial connections.
A null pointer dereference (NPD) bug occurs when a program attempts to access or manipulate memory using a null pointer, leading to a crash or other unexpected behavior.
The impact of this vulnerability could include a denial-of-service (DoS) condition or the execution of arbitrary code with kernel privileges, depending on the attacker's capabilities.
There is no evidence to suggest that this vulnerability has been exploited in the wild. However, it is still important to apply the necessary updates to mitigate the risk.
More information about this vulnerability can be found in the Open Source Vulnerability Database (OSVDB) entry with ID GSD-2022-1002289.
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