Buffer Overflow Vulnerability in Linux Kernel's nl80211.c - CVE-2019-16746
Summary
CVE-2019-16746: An issue was discovered in net/wireless/nl80211.c in the Linux kernel through 5.2.17. Affects linux versions < 5.3.7-1. Fixed in 5.3.7-1. 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 applications. It supports a wide range of functionalities, including process management, memory management, and device control. The kernel's wireless subsystem, particularly the nl80211 interface, is crucial for managing wireless networking. This vulnerability affects various Debian versions of the Linux kernel, making it critical for users relying on wireless connectivity.
Vulnerability Detail
CVE-2019-16746 is a buffer overflow vulnerability found in the net/wireless/nl80211.c file of the Linux kernel, affecting versions up to 5.2.17. The vulnerability arises from the lack of length checks on variable elements in a beacon head, which can lead to a buffer overflow. This could allow an attacker to execute arbitrary code, potentially compromising the system's integrity and confidentiality. The severity of this vulnerability is underscored by its CVSS score of 9.8, indicating a critical risk level.
How To Fix
Minimum fixed version
5.3.7-1
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
As a temporary workaround, users can disable wireless networking to mitigate the risk of exploitation until the kernel is updated. This can be done using the following command:
sudo ip link set wlan0 down
Replace 'wlan0' with the appropriate network interface name.
Conclusion
CVE-2019-16746 represents a significant security risk for users of the Linux kernel, particularly those using Debian-based systems. It is crucial to upgrade to the latest kernel version to mitigate this vulnerability. Users should also consider using tools like Vulert for ongoing monitoring of vulnerabilities in their software.
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FAQ
CVE-2019-16746 is a buffer overflow vulnerability in the Linux kernel's nl80211 wireless subsystem, which can lead to arbitrary code execution.
If exploited, this vulnerability can allow an attacker to execute arbitrary code on your system, potentially leading to unauthorized access and data breaches.
The vulnerability affects the Linux kernel versions up to 5.2.17. Users should upgrade to version 5.3.7-1 or later.
You can use tools like Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected.
If an immediate upgrade is not possible, consider disabling wireless networking as a temporary workaround until the kernel can be updated.
References
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