Critical Race Condition in Linux Kernel Affecting Debian Packages
Summary
DEBIAN-CVE-2026-98507: In the Linux kernel, the following vulnerability has been resolved: mm/rmap: fix missing barrier between anon_vma init and vma->anon_vma publish On arm64 server, we find that a task trying to grab the anon_vma lock trigg... Affects linux versions 6.1.106-1 – 7.3~rc7-1~exp1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of the Debian operating system, responsible for managing system resources and facilitating communication between hardware and software. It is a crucial element that ensures the stability and performance of the system. The kernel is designed to handle multiple processes simultaneously, but vulnerabilities can arise from complex interactions between these processes, leading to potential security risks.
Vulnerability Detail
In the Linux kernel, a race condition vulnerability has been identified in the memory management subsystem, specifically related to the handling of anonymous virtual memory areas (anon_vma). This vulnerability can lead to a situation where two threads concurrently attempt to access and modify shared data structures without proper synchronization, resulting in a use-after-free condition. This can cause tasks to hang indefinitely, leading to system instability and potential denial of service. The vulnerability is triggered when adjacent virtual memory areas (VMAs) are accessed concurrently, allowing for a scenario where one thread may observe stale data from a previously freed memory area, ultimately compromising the integrity of the memory management system.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, you can disable the hung task timeout message by executing the command: echo 0 > /proc/sys/kernel/hung_task_timeout_secs. However, this does not resolve the underlying issue and is not recommended as a long-term solution.
Conclusion
The identified race condition vulnerability in the Linux kernel poses significant risks to system stability and security. It is crucial for users of Debian-based systems to update their kernels to the latest patched versions to mitigate these risks. Utilizing tools like Vulert can help monitor for such vulnerabilities in real-time.
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FAQ
The vulnerability is a race condition in the Linux kernel's memory management subsystem that can lead to system hangs and potential denial of service.
You can use Vulert 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.
Exploitation of this vulnerability can lead to system instability, tasks hanging indefinitely, and denial of service, affecting the overall performance of the system.
Yes, patches are available for affected versions of the Linux kernel. Ensure to update to the latest patched version for your Debian distribution.
If an immediate update is not possible, consider applying the temporary workaround to disable hung task timeout messages, but be aware that this does not fix the underlying issue.
References
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