Buffer Overflow Vulnerability in Linux Kernel's r8188eu Driver
Summary
CVE-2022-49405: In the Linux kernel, the following vulnerability has been resolved: staging: r8188eu: prevent ->Ssid overflow in rtw_wx_set_scan() This code has a check to prevent read overflow but it needs another check to prevent writ... Affects linux versions < 5.18.5-1. Fixed in 5.18.5-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for hardware and software interactions. The r8188eu driver is a staging driver for Realtek's RTL8188E wireless chipset, enabling wireless communication. This driver is crucial for systems relying on Realtek wireless hardware, but it has been identified as vulnerable to a buffer overflow issue that can compromise system integrity.
Vulnerability Detail
The vulnerability, identified as CVE-2022-49405, arises from insufficient checks in the rtw_wx_set_scan() function of the r8188eu driver. While there is a check to prevent reading beyond the buffer, the code lacks a corresponding check to prevent writing past the end of the ->Ssid[] array. This oversight can lead to a buffer overflow, potentially allowing an attacker to execute arbitrary code or crash the system, thereby compromising the security and stability of the affected systems.
How To Fix
Minimum fixed version
5.18.5-1
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 the Linux kernel to the fixed version as described above.
Conclusion
CVE-2022-49405 is a critical vulnerability in the Linux kernel's r8188eu driver that can lead to buffer overflow issues. Users are urged to update their systems to the patched version to ensure security and stability. Regular monitoring for vulnerabilities using tools like Vulert can help maintain the integrity of your software.
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FAQ
CVE-2022-49405 is a vulnerability in the Linux kernel's r8188eu driver that can lead to a buffer overflow due to insufficient checks in the code.
This vulnerability can allow attackers to execute arbitrary code or crash the system, posing a significant security risk.
You should update your Linux kernel to version 5.18.5-1 or later to mitigate the vulnerability.
Yes, you can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. You can check your application using the Vulert playground without any signup.
More information can be found in the official CVE database or through security advisories related to the Linux kernel.
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