Critical NULL Pointer Dereference in Linux Kernel - Debian Packages
Summary
DEBIAN-CVE-2024-53113: In the Linux kernel, the following vulnerability has been resolved: mm: fix NULL pointer dereference in alloc_pages_bulk_noprof We triggered a NULL pointer dereference for ac.preferred_zoneref->zone in alloc_pages_bulk_n... Affects linux versions < 6.1.119-1. Fixed in 6.1.119-1. How to fix ↓
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Background
The Linux kernel is the core component of the Debian operating system, responsible for managing hardware resources and providing essential services to applications. It is known for its stability, performance, and security. However, vulnerabilities can arise, impacting system integrity and performance. This specific vulnerability affects multiple Debian versions (11, 12, 13, and 14) of the Linux package, highlighting the importance of regular updates and security patches.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified that leads to a NULL pointer dereference in the function alloc_pages_bulk_noprof. This issue occurs when a task is migrated between different cpusets, causing a concurrent modification of the nodemask. As a result, the preferred_zoneref may point to a NULL zone, leading to a crash or unexpected behavior in the system. The vulnerability is particularly critical in environments with multiple NUMA nodes, where resource allocation is essential for performance.
How To Fix
Minimum fixed version
6.1.119-1
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. It is highly recommended to apply the patches as soon as they are available to mitigate the risk.
Conclusion
The identified vulnerability in the Linux kernel poses a significant risk to Debian systems, particularly those with multiple NUMA nodes. It is essential to apply the available patches promptly to ensure system stability and security. Regular monitoring for vulnerabilities using tools like Vulert can help maintain a secure environment.
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FAQ
A NULL pointer dereference occurs when a program attempts to access memory at a location that is not valid, leading to crashes or undefined behavior.
This vulnerability can lead to system crashes, affecting the stability and performance of applications running on the affected Linux kernel.
If you are running an affected version of the Linux package on Debian (11, 12, 13, or 14), your system may be vulnerable. Use tools like Vulert to check for vulnerabilities.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software by analyzing a manifest file like package-lock.json.
While there are no specific workarounds, it is crucial to plan for an update as soon as possible to mitigate risks associated with this vulnerability.
References
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