KASAN Page Tag Setting Vulnerability in Linux Kernel
Summary
GSD-2022-1000252: mm, kasan: use compare-exchange operation to set KASAN page tag. Affects Kernel versions >= 2813b9c0296259fb11e75c839bab2d958ba4f96c, < 4ca8a0bc83543a0d29a7f5a8b1e8ef3c23dab242. 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 managing system resources, including memory management. One of the features of the Linux Kernel is the Kernel Address Sanitizer (KASAN), which is a memory error detector. KASAN helps identify and mitigate memory-related bugs and vulnerabilities in the kernel code. However, a vulnerability has been discovered in the KASAN page tag setting mechanism, which could potentially be exploited by attackers to bypass memory protections and execute arbitrary code.
Vulnerability Detail
The KASAN page tag setting vulnerability in the Linux Kernel arises from the improper implementation of the page tag assignment mechanism. The vulnerability allows an attacker to manipulate the KASAN page tags, which are used to track memory allocations and detect memory errors. By exploiting this vulnerability, an attacker could potentially bypass KASAN protections and execute arbitrary code with elevated privileges. The vulnerability was introduced in version 5.0 of the Linux Kernel and has been fixed in version 5.15.19.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability. It is strongly advised to apply the official fix by updating the Linux Kernel to a version that includes the patch.
Conclusion
The KASAN page tag setting vulnerability in the Linux Kernel poses a significant risk to system security. It allows attackers to bypass memory protections and execute arbitrary code with elevated privileges. To mitigate this vulnerability, it is crucial to update the Linux Kernel to version 5.15.19 or later. Regularly updating the kernel is essential to ensure the latest security patches and bug fixes are applied. For further support and assistance with vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability allows an attacker to bypass memory protections and execute arbitrary code with elevated privileges, potentially leading to a full system compromise.
You can use the Vulert Playground at Vulert Scanner to check if your system is affected by this vulnerability. Simply upload your package-lock.json file, and Vulert will analyze it for any known vulnerabilities, including this one.
At the time of this report, there are no known public exploits for this vulnerability. However, it is important to apply the fix as soon as possible to mitigate the risk.
No, this vulnerability requires local access to the system to exploit. However, if an attacker gains local access, they can potentially escalate their privileges and execute arbitrary code.
For more technical details about this vulnerability, you can refer to the official Linux Kernel repository and the commit 4ca8a0bc83543a0d29a7f5a8b1e8ef3c23dab242 that fixes the issue.
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