Critical Vulnerability in Linux Kernel: Use of Uninitialized Memory in SCTP Handling
Summary
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 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for hardware management and system resources. It is known for its stability, performance, and flexibility, supporting a wide range of hardware architectures. However, it is also susceptible to vulnerabilities that can compromise system security and integrity. This specific vulnerability affects the SCTP (Stream Control Transmission Protocol) implementation within the kernel, which is responsible for reliable message delivery in network communications.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the SCTP handling mechanism, specifically concerning the linearization of cloned GSO (Generic Segmentation Offload) packets. The issue arises when a cloned head socket buffer (skb) shares fragment skbs in its fraglist with the original head skb, leading to unsafe access to these fragment skbs. This vulnerability can result in use-of-uninitialized-memory bugs, potentially allowing an attacker to exploit the system, leading to undefined behavior or crashes. The vulnerability was reported by syzbot, highlighting two specific instances where uninitialized values were accessed, causing critical errors in the SCTP processing.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, you may consider disabling SCTP support in your applications if it is not critical for your operations. This can be done by modifying the application configuration files or kernel parameters, depending on your specific setup. However, this is not a permanent solution and should only be used until the system can be updated.
Conclusion
The vulnerability identified in the Linux kernel's SCTP handling poses significant risks to system stability and security. It is crucial for users to update their systems to the patched versions to mitigate these risks. Regular monitoring and vulnerability management practices are essential to maintain system integrity.
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FAQ
The vulnerability can lead to use-of-uninitialized-memory bugs, which may cause system crashes or undefined behavior, potentially allowing attackers to exploit the system.
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 without requiring any signup.
The vulnerability affects all versions of the Linux kernel prior to the patched versions: Debian 13 (6.12.43-1) and Debian 14 (6.16.3-1).
A temporary workaround is to disable SCTP support in your applications, but this should only be a short-term solution until the system can be updated.
It is recommended to regularly check for vulnerabilities and updates, ideally on a weekly basis, to ensure your systems are secure.
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