Critical NULL Pointer Dereference in Linux Kernel - Linux Package Vulnerability
Summary
DEBIAN-CVE-2019-16232: drivers/net/wireless/marvell/libertas/if_sdio.c in the Linux kernel 5.2.14 does not check the alloc_workqueue return value, leading to a NULL pointer dereference. Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. 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 applications. It is widely used across various platforms, including servers, desktops, and embedded systems. The kernel's stability and security are paramount, as vulnerabilities can lead to system crashes or unauthorized access. This specific vulnerability affects the Linux kernel versions 5.2.14 and earlier, particularly in the wireless networking component, where a failure to check the return value of a function can lead to severe issues.
Vulnerability Detail
The vulnerability identified as CVE-2019-16232 arises from a lack of validation for the return value of the alloc_workqueue function in the if_sdio.c file of the Linux kernel. This oversight can lead to a NULL pointer dereference, which may cause the kernel to crash or become unresponsive. Attackers could exploit this vulnerability to disrupt network services or potentially execute arbitrary code, compromising system integrity and availability. The issue is particularly critical in environments where wireless connectivity is essential.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can disable the wireless networking feature until the kernel is updated. This can be done by executing the following command: sudo modprobe -r libertas. However, this is not a permanent solution and updating the kernel is strongly recommended.
Conclusion
CVE-2019-16232 represents a significant vulnerability in the Linux kernel that can lead to severe system issues if left unaddressed. Users are urged to update their systems promptly and consider utilizing tools like Vulert for ongoing vulnerability monitoring.
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FAQ
CVE-2019-16232 is a vulnerability in the Linux kernel that can lead to a NULL pointer dereference due to improper handling of the alloc_workqueue return value.
Exploitation of this vulnerability can result in system crashes, unresponsiveness, or unauthorized access, particularly affecting wireless network functionality.
If you are using Linux kernel version 5.2.14 or earlier, your system is vulnerable to this issue. It is advisable to check your kernel version using the command 'uname -r'.
You should update your Linux kernel to the latest patched version as soon as possible. Use the command 'sudo apt-get update && sudo apt-get install linux' to perform the update.
Yes, you can use Vulert, which monitors and alerts for open-source vulnerabilities in your software using a manifest file like package-lock.json. You can check your application for vulnerabilities without needing to install anything by visiting the Vulert playground.
References
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