Critical Memory Management Vulnerability in Linux Kernel - CVE-2023-52934
Summary
CVE-2023-52934: In the Linux kernel, the following vulnerability has been resolved: mm/MADV_COLLAPSE: catch !none !huge !bad pmd lookups In commit 34488399fa08 ("mm/madvise: add file and shmem support to MADV_COLLAPSE") we make the foll... Affects linux versions < 6.1.11-1. Fixed in 6.1.11-1. 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 manages system resources, including memory, processes, and device drivers. The kernel's memory management subsystem is crucial for efficient operation, but it can also be a target for vulnerabilities that may lead to system instability or security breaches. CVE-2023-52934 highlights a specific issue in the memory management code related to the MADV_COLLAPSE functionality, which could potentially allow unauthorized access to memory or lead to system crashes.
Vulnerability Detail
CVE-2023-52934 is a vulnerability in the Linux kernel's memory management subsystem, specifically in the MADV_COLLAPSE feature. The issue arises from a logical flaw introduced in commit 34488399fa08, where the code fails to properly classify certain page table entries (pmds). This oversight allows invalid pmds, such as swap entries, to be treated as valid, leading to potential memory access violations. The vulnerability can result in incorrect memory management operations, which may compromise system stability and security. The flaw is particularly concerning as it may allow attackers to exploit the memory management functions to gain unauthorized access to sensitive data or cause system crashes.
How To Fix
Minimum fixed version
6.1.11-1
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 MADV_COLLAPSE functionality until the system is updated to the patched version. This can help mitigate the risk of exploitation while waiting for a permanent fix.
Conclusion
CVE-2023-52934 is a critical vulnerability in the Linux kernel's memory management subsystem that can lead to serious security and stability issues. Users are advised to update their systems to the patched version to mitigate the risks associated with this vulnerability. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
CVE-2023-52934 is a vulnerability in the Linux kernel's memory management subsystem that can lead to incorrect memory management operations.
The vulnerability may allow unauthorized access to memory or cause system crashes, potentially compromising system stability and security.
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.
As a temporary measure, avoid using the MADV_COLLAPSE functionality until you can update to the patched version.
More details can be found in the official CVE report and the Linux kernel changelog related to commit 34488399fa08.
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