Critical Memory Access Vulnerability in Linux Kernel: DEBIAN-CVE-2024-50207
Summary
DEBIAN-CVE-2024-50207: In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Fix reader locking when changing the sub buffer order The function ring_buffer_subbuf_order_set() updates each ring_buffer_per_cpu and inst... Affects linux versions < 6.11.6-1. Fixed in 6.11.6-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, including Debian. It manages system resources and hardware communication, providing essential services for software applications. The kernel is designed for stability and performance, but vulnerabilities can arise, impacting system security and reliability. This specific vulnerability affects the ring buffer mechanism, which is crucial for managing data streams between different parts of the kernel.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the ring buffer mechanism, specifically in the function ring_buffer_subbuf_order_set(). This function updates the ring_buffer_per_cpu and installs new sub buffers that match the requested page order. The issue arises when this operation is executed concurrently with readers that depend on the modified data, such as the head bit (RB_PAGE_HEAD) and pointers to ring_buffer_per_cpu.pages and reader_page. Without exclusive access during this update, it can lead to incorrect memory access, resulting in crashes and unpredictable behavior.
How To Fix
Minimum fixed version
6.11.6-1
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 mentioned for this vulnerability. The best course of action is to apply the patch by updating the package as described above.
Conclusion
The DEBIAN-CVE-2024-50207 vulnerability in the Linux kernel poses significant risks due to potential incorrect memory access. It is essential to update to the patched version 6.11.6-1 to safeguard your system. Regular monitoring and timely updates are vital for maintaining system security.
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FAQ
It is a vulnerability in the Linux kernel that affects the ring buffer mechanism, potentially leading to incorrect memory access and system crashes.
You can use Vulert, which monitors open-source vulnerabilities in your software. By utilizing the manifest file like package-lock.json, it can alert you in real-time. You can also check your application using the Vulert playground at Vulert Scanner.
The vulnerability can lead to incorrect memory access, resulting in crashes and unpredictable behavior of the system.
Yes, a patch is available in version 6.11.6-1 of the Linux package for both Debian 13 and 14.
While there are no specific workarounds, it is crucial to plan for an update as soon as possible to mitigate the risks associated with this vulnerability.
References
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