Critical Synchronization Issue in Linux Kernel Package: linux - Preventing System Hang
Summary
DEBIAN-CVE-2025-22053: In the Linux kernel, the following vulnerability has been resolved: net: ibmveth: make veth_pool_store stop hanging v2: - Created a single error handling unlock and exit in veth_pool_store - Greatly expanded commit messa... Affects linux versions < 6.12.25-1. Fixed in 6.12.25-1. How to fix ↓
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Background
The 'linux' package is the core of the Debian operating system, providing essential functionalities for managing hardware and system resources. It is responsible for executing user commands, managing memory, and facilitating communication between software and hardware components. This package is crucial for system stability and performance, making it imperative to address any vulnerabilities that may arise.
Vulnerability Detail
In the Linux kernel, a critical vulnerability has been identified in the 'ibmveth' driver related to the veth_pool_store function. This issue arises from improper synchronization, allowing multiple threads to call veth_pool_store simultaneously, leading to potential system hangs. The vulnerability can be exploited by writing to specific sysfs entries, causing the system to become unresponsive. The root cause is the lack of proper locking mechanisms, which can result in deadlocks and blocked tasks, severely impacting system performance.
How To Fix
Minimum fixed version
6.12.25-1
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
As a temporary workaround, users can avoid writing to the sysfs entries related to 'veth_pool_store' until the package is updated. This can be done by refraining from executing scripts or commands that modify these settings concurrently.
Conclusion
The vulnerability in the Linux kernel's 'linux' package poses a serious risk of system hangs due to improper synchronization in the ibmveth driver. Users are strongly advised to update to the patched version to mitigate this risk. In the meantime, avoiding concurrent modifications to the affected sysfs entries can serve as a temporary workaround.
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FAQ
The vulnerability can lead to system hangs, causing tasks to be blocked for extended periods, which may disrupt normal operations.
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Yes, a patch is available in version 6.12.25-1 of the 'linux' package. It is recommended to update to this version or later.
If an immediate update is not possible, avoid using the affected sysfs entries to prevent triggering the vulnerability.
The vulnerability can cause significant performance degradation by blocking tasks, leading to unresponsive behavior in the system.
References
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