Critical NULL Pointer Dereference Vulnerability in Linux Kernel Package
Summary
DEBIAN-CVE-2024-46856: In the Linux kernel, the following vulnerability has been resolved: net: phy: dp83822: Fix NULL pointer dereference on DP83825 devices The probe() function is only used for DP83822 and DP83826 PHY, leaving the private da... Affects linux versions < 6.10.11-1. Fixed in 6.10.11-1. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing hardware resources and providing essential services to software applications. It is widely used across various platforms, including servers, desktops, and embedded systems. This vulnerability specifically affects the DP83825 PHY models, which are used in networking hardware, leading to potential system crashes or instability if not addressed.
Vulnerability Detail
In the Linux kernel, a NULL pointer dereference vulnerability has been identified in the handling of DP83825 devices within the net: phy: dp83822 module. The probe() function was only implemented for DP83822 and DP83826 PHYs, leaving the private data pointer uninitialized for DP83825 models. This oversight can lead to a NULL pointer dereference in the functions dp8382x_config_init() and dp83822_set_wol(), potentially causing system crashes or unexpected behavior. The vulnerability is critical as it can affect the stability of systems relying on these PHY models.
How To Fix
Minimum fixed version
6.10.11-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. The best course of action is to apply the patch by updating to the fixed version of the Linux kernel.
Conclusion
The identified NULL pointer dereference vulnerability in the Linux kernel poses significant risks to systems utilizing DP83825 PHY models. It is crucial for users to update their kernel to the patched version to mitigate these risks and maintain system stability.
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FAQ
A NULL pointer dereference occurs when a program attempts to access memory that has not been allocated or is set to NULL, leading to crashes or undefined behavior.
You can check if your system is affected by using tools like Vulert, which monitors open-source vulnerabilities in your software without requiring code access.
The potential impacts include system crashes, instability, and unexpected behavior in applications relying on the affected PHY models.
While the primary risk is system instability, there is a potential for data loss if the system crashes during critical operations.
It is recommended to regularly check for updates and apply them promptly to ensure that your system is protected against known vulnerabilities.
References
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