Memory Leak Vulnerability in Linux Kernel's io_uring Functionality - CVE-2024-0582
Summary
DEBIAN-CVE-2024-0582: A memory leak flaw was found in the Linux kernel’s io_uring functionality in how a user registers a buffer ring with IORING_REGISTER_PBUF_RING, mmap() it, and then frees it. Affects linux versions < 6.6.8-1. Fixed in 6.6.8-1. How to fix ↓
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Background
The Linux kernel is a core component of many operating systems, providing the essential interface between hardware and software. It manages system resources and allows applications to communicate with hardware devices. The io_uring functionality is a modern interface for asynchronous I/O operations, designed to improve performance and efficiency. However, a memory leak vulnerability has been identified in this functionality, specifically related to the registration and management of buffer rings.
Vulnerability Detail
A memory leak flaw was found in the Linux kernel’s io_uring functionality. This issue arises when a user registers a buffer ring with IORING_REGISTER_PBUF_RING, mmap() it, and subsequently frees it. The flaw allows a local user to potentially crash the system or escalate their privileges, posing a significant security risk. The vulnerability is tracked under CVE-2024-0582 and affects Debian versions 13 and 14 of the linux package, with the flaw introduced in all versions prior to the fixed version 6.6.8-1.
How To Fix
Minimum fixed version
6.6.8-1
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
As a temporary workaround, users can avoid using the io_uring functionality until the system is updated to the patched version. Additionally, restricting access to the affected functionality may help mitigate the risk of exploitation.
Conclusion
The memory leak vulnerability in the Linux kernel's io_uring functionality poses a serious risk to system security, allowing potential privilege escalation and system crashes. It is crucial for users of Debian versions 13 and 14 to update to the patched version 6.6.8-1 to mitigate this risk. Utilizing tools like Vulert can help monitor and manage vulnerabilities effectively.
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FAQ
CVE-2024-0582 is a memory leak vulnerability found in the Linux kernel's io_uring functionality, which could allow local users to crash the system or escalate privileges.
The vulnerability affects Debian versions 13 and 14 of the linux package, specifically all versions prior to 6.6.8-1.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. By using the Vulert playground, you can check if your application is affected without any signup.
If immediate updates are not possible, consider restricting access to the io_uring functionality as a temporary measure to mitigate risks.
More information can be found in the official Debian CVE database or by visiting the provided source link in the vulnerability details.
References
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