Mismatch between reconstructed freelist depth and cnt in mm, slub
Summary
UVI-2021-1001874: mm, slub: fix mismatch between reconstructed freelist depth and cnt. Affects Kernel versions >= c3895391df385c6628638f014c87e16f5e2efd45, < ec93d4a439c3a619b6682ba5778dc885d1460d3e. 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 occurs in the mm (memory management) subsystem, specifically in the slub allocator. The slub allocator is responsible for managing kernel memory allocations and deallocations. This vulnerability can lead to a mismatch between the reconstructed freelist depth and the cnt value, potentially causing memory corruption or other security issues.
Vulnerability Detail
The vulnerability arises due to a mismatch between the reconstructed freelist depth and the cnt value in the slub allocator. This mismatch can occur when the freelist is being reconstructed, leading to incorrect calculations and potential memory corruption. An attacker may be able to exploit this vulnerability to gain unauthorized access, escalate privileges, or cause a denial-of-service condition. The impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
No specific workaround has been mentioned for this vulnerability.
Conclusion
In conclusion, the vulnerability in the mm, slub allocator of the Kernel package can result in a mismatch between the reconstructed freelist depth and the cnt value, potentially leading to memory corruption or other security issues. It is crucial to update the Kernel to the latest version (v5.14.15) to mitigate this vulnerability. Additionally, it is recommended to follow best practices for system security and keep all software components up to date.
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FAQ
The impact of this vulnerability can vary depending on the attacker's capabilities and the specific system configuration. It could potentially lead to unauthorized access, privilege escalation, or denial-of-service.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your manifest file (e.g., package-lock.json) and Vulert will analyze it for open-source vulnerabilities in real-time.
As of now, there are no known exploits for this vulnerability. However, it is always recommended to apply security patches and updates to mitigate potential risks.
The exact attack vector and exploitability of this vulnerability have not been proven yet. It is advisable to keep your system up to date with the latest security patches to minimize the risk of remote exploitation.
For further support on vulnerability remediation or any other security concerns, you can reach out to info@devnack.com. Our team of experts will be happy to assist you.
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