Vulnerability in Kernel: mm, hugetlb: fix simple resv_huge_pages underflow on UFFDIO_COPY
Summary
GSD-2021-1000745: mm, hugetlb: fix simple resv_huge_pages underflow on UFFDIO_COPY. Affects Kernel versions >= 8fb5debc5fcd450470cdd789c2d80ef95ebb8cf4, < 7de60c2d5a2a66ef2c5d76952a5a3a9a4ea4d436. No fix is published. How to fix ↓
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Background
The Kernel is a fundamental component of the Linux operating system that manages system resources and provides an interface for applications to interact with the hardware. It is responsible for memory management, process scheduling, device drivers, and other critical functions. The vulnerability in question affects the mm (memory management) subsystem and specifically the hugetlb (huge pages) feature. Huge pages are larger memory pages that can improve performance for certain workloads. The vulnerability allows for a simple resv_huge_pages underflow on UFFDIO_COPY, potentially leading to security breaches or system instability.
Vulnerability Detail
The vulnerability arises from a flaw in the implementation of resv_huge_pages under UFFDIO_COPY in the mm subsystem. This flaw can be exploited by an attacker to trigger an underflow condition, potentially leading to memory corruption or other security issues. The impact and attack plausibility of this vulnerability have not been proven yet. The vulnerability was introduced in version v4.11 of the Linux Kernel and has been fixed in version v4.19.194 by commit 7de60c2d5a2a66ef2c5d76952a5a3a9a4ea4d436.
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.
Conclusion
The vulnerability in the Kernel's mm subsystem, specifically in the hugetlb feature, can result in a simple resv_huge_pages underflow on UFFDIO_COPY. This vulnerability has been fixed in version v4.19.194 of the Linux Kernel. It is recommended to update the Kernel to the fixed version or apply the necessary patches as soon as possible to mitigate potential security risks. For further support or assistance with vulnerability remediation, you can contact DevNack.com.
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FAQ
The impact of this vulnerability can vary depending on the specific system and its usage. It could potentially lead to security breaches, system instability, or memory corruption.
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 the playground will analyze it for any open-source vulnerabilities, including this one.
As of now, there are no known exploits for this vulnerability. However, it is always recommended to apply security patches promptly to mitigate potential risks.
The exact attack vector and exploitability of this vulnerability have not been proven yet. It is advisable to follow best security practices and keep the system updated to minimize potential risks.
For more details about this vulnerability, including the specific code changes that fix it, you can refer to the vulnerability database entry at https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1000xxx/GSD-2021-1000745.json.
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