Mismatch between reconstructed freelist depth and cnt in mm, slub
Summary
GSD-2021-1001839: mm, slub: fix mismatch between reconstructed freelist depth and cnt. Affects Kernel versions >= c3895391df385c6628638f014c87e16f5e2efd45, < 48843dd23c7bfcb0f0c3a02926d660f939dc2b9f. No fix is published. How to fix ↓
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Background
The vulnerability affects the Kernel package in the Linux ecosystem. The Kernel is the core component of the operating system that manages system resources and provides an interface for software to interact with the hardware. The specific vulnerability is related to the mm (memory management) subsystem and the slub allocator. The slub allocator is responsible for managing kernel memory allocations. The vulnerability arises due to a mismatch between the reconstructed freelist depth and the cnt (count) value. This mismatch can lead to memory corruption and potential security issues.
Vulnerability Detail
The vulnerability occurs in the mm, slub subsystem of the Linux Kernel. It was introduced in version v4.17 and fixed in version v5.10.76. The issue arises when reconstructing the freelist depth, which can result in a mismatch with the cnt value. This mismatch can lead to memory corruption and potential security vulnerabilities. Attackers may exploit this vulnerability to gain unauthorized access, execute arbitrary code, or cause denial of service. It is important to update to the fixed version to mitigate the risk.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability. The recommended approach is to update to the fixed version of the Linux Kernel.
Conclusion
The vulnerability in the mm, slub subsystem of the Linux Kernel can lead to memory corruption and potential security issues. It is crucial to update to the fixed version (v5.10.76 or later) to mitigate the risk. Following security best practices and staying informed about the latest security updates is essential to maintain a secure system. For further support on vulnerability remediation, you can contact DevNack.com.
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FAQ
The vulnerability can lead to memory corruption and potential security issues. Attackers may exploit it to gain unauthorized access, execute arbitrary code, or cause denial of service.
You can use tools like Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Vulert Playground allows you to analyze your manifest file (e.g., package-lock.json) without requiring access to the code or installation.
At the time of this report, there is no known public exploit for this vulnerability. However, it is important to update to the fixed version to mitigate the risk.
The primary mitigation is to update the Linux Kernel package to the fixed version. Additionally, following security best practices such as restricting access to vulnerable systems and implementing network security measures can help reduce the risk.
You can refer to the provided references link for more details about this vulnerability. Additionally, you can reach out to info@devnack.com for further support on vulnerability remediation.
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