Critical TLB Flush Suppression Vulnerability in Linux Kernel
Summary
CVE-2025-37964: In the Linux kernel, the following vulnerability has been resolved: x86/mm: Eliminate window where TLB flushes may be inadvertently skipped tl;dr: There is a window in the mm switching code where the new CR3 is set and t... Affects linux versions < 6.1.140-1. Fixed in 6.1.140-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, responsible for managing hardware resources and providing essential services to software applications. It is known for its stability, performance, and security features. However, vulnerabilities can arise, affecting its reliability and security. This specific vulnerability pertains to the memory management subsystem, which is crucial for efficient memory allocation and process isolation.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified where the TLB (Translation Lookaside Buffer) flushes may be inadvertently skipped during memory management switching. This issue arises from a bug in the should_flush_tlb() function, which suppresses necessary flushes in a specific timing window. The consequence of this vulnerability is that it could lead to stale memory references, potentially allowing unauthorized access to sensitive data or causing system instability. The vulnerability was introduced due to aggressive optimizations in the code that manages CPU memory masks, leading to missed flushes when switching memory contexts.
How To Fix
Minimum fixed version
6.1.140-1
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 as soon as it becomes available.
Conclusion
The TLB flush suppression vulnerability in the Linux kernel poses significant risks to system security and stability. Users are strongly advised to update their systems to the latest kernel version to mitigate these risks. Utilizing tools like Vulert can help monitor and manage vulnerabilities effectively.
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FAQ
The impact includes potential unauthorized access to sensitive data and system instability due to stale memory references.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. Visit Vulert Scanner to check if your application is affected.
Yes, a patch has been released. Users should update their Linux kernel to the latest version to apply the fix.
While there are no specific workarounds, it is recommended to monitor the situation and apply the patch as soon as possible.
The TLB is a cache that stores recent translations of virtual memory addresses to physical memory addresses, improving the efficiency of memory access.
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