Vulnerability in Linux Kernel: mm, hugetlb: fix simple resv_huge_pages underflow on UFFDIO_COPY
Summary
GSD-2021-1000783: mm, hugetlb: fix simple resv_huge_pages underflow on UFFDIO_COPY. Affects Kernel versions >= 8fb5debc5fcd450470cdd789c2d80ef95ebb8cf4, < 2eb4ec9c2c3535b9755c484183cc5c4d90fd37ff. No fix is published. How to fix ↓
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Background
The Linux Kernel is a critical component of the Linux operating system, responsible for managing system resources and providing an interface between hardware and software. It is a widely used open-source package that powers numerous devices and servers. The mm subsystem within the kernel handles memory management, including the allocation and deallocation of memory pages. One specific feature of the mm subsystem is hugetlb, which allows for the allocation of large memory pages. This vulnerability affects the hugetlb functionality in the Linux Kernel.
Vulnerability Detail
The vulnerability, identified as GSD-2021-1000783, is a simple resv_huge_pages underflow on UFFDIO_COPY in the mm subsystem of the Linux Kernel. This vulnerability was introduced in version v4.11 of the kernel and was fixed in version v5.10.43. The vulnerability arises when handling userfaultfd (UFFD) copy operations, leading to an underflow in the resv_huge_pages counter. An attacker could potentially exploit this vulnerability to gain elevated privileges or cause a denial-of-service (DoS) 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
There is no specific workaround mentioned for this vulnerability.
Conclusion
In conclusion, the vulnerability in the Linux Kernel's mm subsystem, specifically in the hugetlb functionality, could potentially allow an attacker to gain elevated privileges or cause a denial-of-service (DoS) condition. It is crucial to update the Linux Kernel to version v5.10.43 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The impact of this vulnerability could potentially allow an attacker to gain elevated privileges or cause a denial-of-service (DoS) condition.
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 to the playground, and it will provide real-time monitoring and alerts for open-source vulnerabilities, including this one.
At the time of this report, there is no known exploit for this vulnerability. However, it is important to apply the recommended fix to mitigate any potential risks.
The exact attack vector and exploitability of this vulnerability have not been proven yet. It is advisable to update the Linux Kernel to the latest version to ensure the system is protected against potential remote exploitation.
The recommended solution is to update the Linux Kernel to version v5.10.43 or later. It is not advisable to rely on alternative solutions or workarounds, as they may not provide comprehensive protection against the vulnerability.
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