Linux Kernel Vulnerability in CPU Mask Handling - CVE-2024-41032
Summary
DEBIAN-CVE-2024-41032: In the Linux kernel, the following vulnerability has been resolved: mm: vmalloc: check if a hash-index is in cpu_possible_mask The problem is that there are systems where cpu_possible_mask has gaps between set CPUs, for... Affects linux versions < 6.9.10-1. Fixed in 6.9.10-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, managing hardware resources and providing essential services to software applications. It is known for its stability, performance, and flexibility. However, it is also susceptible to vulnerabilities that can affect system security and functionality. This particular vulnerability, CVE-2024-41032, arises from improper handling of CPU masks, specifically in systems where there are gaps in the set CPUs, such as SPARC architecture.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the memory management subsystem, specifically related to the vmalloc function. The issue occurs when the addr_to_vb_xa() hash function generates an index that points to a CPU area that is not possible or not set up, leading to a system crash (oops) on SPARC systems. This vulnerability arises from the incorrect assumption that the cpu_possible_mask has no gaps, which can result in accessing invalid memory areas and potentially compromising system stability.
How To Fix
Minimum fixed version
6.9.10-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. The best course of action is to apply the patch by updating the Linux package as described above.
Conclusion
The CVE-2024-41032 vulnerability in the Linux kernel highlights the importance of maintaining up-to-date software to ensure system security and stability. Users are encouraged to apply the necessary updates to mitigate potential risks associated with this issue.
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FAQ
CVE-2024-41032 is a vulnerability in the Linux kernel that affects systems with gaps in the CPU mask, leading to potential system crashes.
This vulnerability primarily affects SPARC systems where the cpu_possible_mask has gaps between set CPUs.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without requiring any signup.
While there are no specific workarounds, it is crucial to plan for an update as soon as possible to mitigate the risk associated with this vulnerability.
More details about CVE-2024-41032 can be found in the Debian security advisories and the official Linux kernel documentation.
References
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