Use-After-Free Vulnerability in Linux Kernel IPCS Lookups
Summary
CVE-2025-38212: In the Linux kernel, the following vulnerability has been resolved: ipc: fix to protect IPCS lookups using RCU syzbot reported that it discovered a use-after-free vulnerability, [0] [0]: https://lore.kernel.org/all/67af1... 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 and software interaction. It is known for its stability, performance, and extensive support for various hardware architectures. However, like any complex software, it is susceptible to vulnerabilities. This specific issue affects the IPCS (Inter-Process Communication System) lookups, which are crucial for managing shared memory and other IPC mechanisms.
Vulnerability Detail
In the Linux kernel, a use-after-free vulnerability was discovered in the IPCS lookups. This issue arises when the idr_for_each() function, which is responsible for iterating over IDR (ID Radix) structures, is not adequately protected by an RCU (Read-Copy-Update) read-critical region. When idr_for_each() calls radix_tree_node_free() through call_rcu() to free a radix_tree_node structure, the node can be freed immediately. If the next node is read in radix_tree_for_each_slot() after this, it may access already freed memory, leading to potential crashes or exploitation.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. It is advisable to apply the patch as soon as it becomes available to mitigate risks.
Conclusion
The use-after-free vulnerability in the Linux kernel's IPCS lookups poses significant risks to system stability and security. Users are urged to update their Linux packages to the latest versions to mitigate these risks. Utilizing tools like Vulert can help monitor for such vulnerabilities effectively.
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FAQ
A use-after-free vulnerability occurs when a program continues to use a memory location after it has been freed, potentially leading to crashes or arbitrary code execution.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. By simply using a manifest file like package-lock.json, you can check for vulnerabilities without needing to install any software.
Exploitation of this vulnerability could lead to system crashes, data corruption, or unauthorized access to sensitive information.
Yes, the vulnerability affects multiple versions of the Linux package across Debian 11, 12, and 13.
It is recommended to regularly check for updates and apply them promptly to ensure your system is protected against known vulnerabilities.
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