Directory Offset Vulnerability in Linux Kernel Package: Infinite Directory Reads Issue
Summary
DEBIAN-CVE-2024-57952: In the Linux kernel, the following vulnerability has been resolved: Revert "libfs: fix infinite directory reads for offset dir" The current directory offset allocator (based on mtree_alloc_cyclic) stores the next offset... Affects linux versions < 6.12.12-1. Fixed in 6.12.12-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, responsible for managing hardware and system resources. It provides essential services for all other parts of the operating system. This vulnerability affects the directory offset allocator, which is crucial for managing how directory entries are read and accessed. The issue arises from a specific commit that incorrectly handles directory offsets, leading to potential data visibility problems.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified due to the improper handling of directory offsets after a specific commit. The offset allocator, which is designed to return increasing offset values, can wrap around to lower values, causing existing directory entries to become invisible during read operations. This issue particularly affects 32-bit systems where the offset can wrap after a short period, leading to persistent data loss in directory reads. The vulnerability was reported by Yu Kuai and is linked to the commit that treats directory offsets as monotonically increasing integers instead of opaque cookies.
How To Fix
Minimum fixed version
6.12.12-1
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 directory read operations that may trigger this vulnerability until the package is updated. Additionally, monitoring directory entries manually can help mitigate the impact of this issue until a fix is applied.
Conclusion
The identified vulnerability in the Linux kernel poses significant risks related to directory entry visibility. Users are strongly advised to update their systems to the patched version to mitigate these risks. Utilizing tools like Vulert can help in monitoring and managing vulnerabilities effectively.
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FAQ
The vulnerability involves the improper handling of directory offsets in the Linux kernel, leading to invisible directory entries during read operations.
The vulnerability affects the Linux kernel versions prior to 6.12.12-1 in both Debian 13 and Debian 14.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without requiring any signup.
Failing to address this vulnerability may result in persistent data loss, as directory entries may become invisible, impacting applications that rely on accurate directory reads.
Yes, the permanent fix is included in the updated package version 6.12.12-1. Users should update their Linux kernel to this version to resolve the vulnerability.
References
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