Critical Vulnerability in Linux Kernel: Use of Uninitialized Memory in SCTP Handling
Summary
DEBIAN-CVE-2025-38718: In the Linux kernel, the following vulnerability has been resolved: sctp: linearize cloned gso packets in sctp_rcv A cloned head skb still shares these frag skbs in fraglist with the original head skb. 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 many operating systems, providing essential services for all other parts of the system. It manages hardware resources, system calls, and process management. This vulnerability affects the SCTP (Stream Control Transmission Protocol) handling within the kernel, which is crucial for reliable, message-oriented communication. The vulnerability arises from improper handling of cloned GSO (Generic Segmentation Offload) packets, leading to potential security risks.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the SCTP handling that allows for the use of uninitialized memory. This issue can lead to undefined behavior, including crashes or data leaks. The vulnerability was reported by syzbot, highlighting two specific instances where uninitialized memory was accessed, potentially exposing sensitive information or causing system instability. The vulnerability is classified under CVE-2025-38718.
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, no specific workarounds have been provided for this vulnerability. It is recommended to apply the patch as soon as it is available.
Conclusion
The vulnerability CVE-2025-38718 in the Linux kernel poses significant risks due to the improper handling of SCTP packets. It is essential for users to update their systems to the patched versions to mitigate these risks. Regular monitoring and vulnerability management practices, such as using tools like Vulert, can help maintain system security.
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FAQ
CVE-2025-38718 is a vulnerability in the Linux kernel related to the improper handling of cloned GSO packets in SCTP, leading to the use of uninitialized memory.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without requiring any signup.
The risks include potential crashes, data leaks, and undefined behavior in applications relying on SCTP for communication.
Yes, patches are available for Debian 13 and 14. Ensure to update to the specified versions to mitigate the vulnerability.
While no specific workarounds are available, it is crucial to prioritize applying the patch as soon as possible to protect your system.
References
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