Critical Vulnerability in Linux Kernel: EXT4 Remount Stripe Size Check
Summary
DEBIAN-CVE-2024-47700: In the Linux kernel, the following vulnerability has been resolved: ext4: check stripe size compatibility on remount as well We disable stripe size in __ext4_fill_super if it is not a multiple of the cluster ratio howeve... Affects linux versions < 6.11.2-1. Fixed in 6.11.2-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, including Debian, providing essential functionalities such as process management, memory management, and device control. The kernel is crucial for system stability and performance. This vulnerability affects the EXT4 filesystem, which is widely used for its reliability and performance. The issue arises during the remounting process, where a critical check for stripe size compatibility is overlooked, potentially leading to system instability.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the EXT4 filesystem related to the handling of stripe sizes during the remount process. Specifically, the check for stripe size compatibility with the cluster ratio is not performed when remounting, which can result in a situation where the stripe size is less than the cluster ratio. This oversight can lead to critical bugs, including division by zero errors, which can compromise system stability and functionality.
How To Fix
Minimum fixed version
6.11.2-1
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. It is advisable to apply the patch as soon as it is available to mitigate any risks associated with this issue.
Conclusion
The vulnerability identified in the Linux kernel's EXT4 filesystem poses a significant risk to system stability due to a missed check during the remount process. It is crucial for users of Debian 13 and 14 to update to the patched version 6.11.2-1 to mitigate this risk. Regular monitoring for vulnerabilities using tools like Vulert can help maintain system security.
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FAQ
The vulnerability is related to the EXT4 filesystem in the Linux kernel, where a critical check for stripe size compatibility is missed during the remount process.
The vulnerability affects Debian 13 and 14 systems running the Linux kernel versions prior to 6.11.2-1.
If exploited, this vulnerability can lead to system instability, including critical bugs such as division by zero errors.
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 needing to sign up.
Currently, there are no specific workarounds available. It is recommended to apply the patch as soon as it is released.
References
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