Critical Vulnerability in Linux Kernel: Unmanaged PTP Clock Initialization
Summary
CVE-2025-21924: In the Linux kernel, the following vulnerability has been resolved: net: hns3: make sure ptp clock is unregister and freed if hclge_ptp_get_cycle returns an error During the initialization of ptp, hclge_ptp_get_cycle mig... Affects linux versions < 6.1.133-1. Fixed in 6.1.133-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for hardware and software interaction. It is known for its stability, performance, and versatility across various platforms. However, vulnerabilities can arise, impacting system security and functionality. This specific vulnerability pertains to the handling of Precision Time Protocol (PTP) clocks, which are crucial for time-sensitive applications.
Vulnerability Detail
In the Linux kernel, specifically within the hns3 network driver, there exists a vulnerability where the PTP clock may not be properly unregistered and freed if the function hclge_ptp_get_cycle returns an error during initialization. This oversight can lead to resource leaks and potential system instability, as the clock remains registered without proper management. The vulnerability is critical as it can affect systems relying on accurate time synchronization, potentially leading to broader operational issues.
How To Fix
Minimum fixed version
6.1.133-1
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 provided for this vulnerability. It is recommended to apply the patch as soon as it becomes available.
Conclusion
The vulnerability CVE-2025-21924 in the Linux kernel poses a significant risk due to improper handling of PTP clock initialization. Users are urged to update their systems to the patched version to mitigate potential issues. Regular monitoring and prompt updates are essential to maintain system security.
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FAQ
The vulnerability involves improper management of PTP clocks in the Linux kernel, leading to potential resource leaks.
If left unaddressed, the vulnerability can lead to system instability and issues with time-sensitive applications.
Yes, a patch is available for Debian 13 in version 6.12.19-1. Users should update to this version.
Users of Debian 12 should monitor for updates as the urgency for a patch has not yet been assigned.
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