TLS Data Handling Vulnerability in Linux Kernel: Impacting Debian Packages
Summary
DEBIAN-CVE-2025-38616: In the Linux kernel, the following vulnerability has been resolved: tls: handle data disappearing from under the TLS ULP TLS expects that it owns the receive queue of the TCP socket. Affects linux versions < 6.12.43-1. Fixed in 6.12.43-1. 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 hardware communication. It provides essential functionalities such as process management, memory management, and device control. The kernel is crucial for system stability and security, making it vital to address vulnerabilities that may compromise its integrity.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified related to the TLS (Transport Layer Security) implementation. This issue arises when data unexpectedly disappears from the TLS User-Level Protocol (ULP). The TLS expects to manage the receive queue of the TCP socket, but this assumption can be violated if a reader accesses the TCP socket before the TLS ULP is installed or uses a non-standard read API. The vulnerability can lead to undefined behavior, including potential data corruption or missing alerts, without causing a kernel crash. This flaw has been documented as DEBIAN-CVE-2025-38616.
How To Fix
Minimum fixed version
6.12.43-1
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 advisable to apply the patch as soon as it is available to mitigate any potential risks.
Conclusion
The TLS data handling vulnerability in the Linux kernel poses significant risks to Debian systems. It is essential to update to the patched versions to ensure system integrity and security. Regular monitoring using tools like Vulert can help in identifying and addressing such vulnerabilities promptly.
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FAQ
The vulnerability involves improper handling of data by the TLS ULP in the Linux kernel, which can lead to undefined behavior.
Debian 13 and Debian 14 are affected, specifically versions prior to 6.12.43-1 and 6.16.3-1 respectively.
You can use tools like Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected.
Failure to address this vulnerability may lead to data corruption, missing alerts, or other undefined behaviors, potentially compromising system security.
Currently, there are no specific workarounds available. It is crucial to apply the patch as soon as it is released.
References
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