Vulnerability in Kernel: mm, hugetlb: fix simple resv_huge_pages underflow on UFFDIO_COPY
Summary
UVI-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 Kernel is a critical component of the Linux operating system that manages system resources and facilitates communication between hardware and software. It provides essential functionalities such as memory management, process scheduling, and device drivers. The vulnerability in the Kernel, specifically in the mm and hugetlb subsystems, allows for a simple resv_huge_pages underflow on UFFDIO_COPY operations.
Vulnerability Detail
The vulnerability arises from an underflow issue in the resv_huge_pages function when handling UFFDIO_COPY operations. An attacker could exploit this vulnerability to trigger a memory corruption or denial-of-service condition. The impact and attack plausibility of this vulnerability have not been proven yet. The vulnerability was introduced in Kernel version v4.11 and has been fixed in version v5.10.43.
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 and hugetlb subsystems can lead to memory corruption or denial-of-service. 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 lead to memory corruption 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 package-lock.json file and the Vulert Playground will provide real-time alerts for open-source vulnerabilities.
No known exploit has been reported for this vulnerability at this time.
The recommended mitigation is to update the Linux Kernel to version v5.10.43 or later.
You can find more information about this vulnerability in the official Linux Kernel repository and the Vulert database (https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1000xxx/UVI-2021-1000783.json).
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