Off-by-One Errors in Fast-Commit Block Filling in Linux Kernel - CVE-2022-50428
Summary
DEBIAN-CVE-2022-50428: In the Linux kernel, the following vulnerability has been resolved: ext4: fix off-by-one errors in fast-commit block filling Due to several different off-by-one errors, or perhaps due to a late change in design that wasn... Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing system resources and facilitating communication between hardware and software. It supports various functionalities, including process management, memory management, and device control. The kernel is crucial for system stability and performance. This specific vulnerability affects the ext4 filesystem, which is widely used in Linux distributions for its robustness and performance. The vulnerability arises from improper handling of fast-commit blocks, leading to potential data integrity issues.
Vulnerability Detail
In the Linux kernel, specifically within the ext4 filesystem, an off-by-one error has been identified in the handling of fast-commit blocks. This vulnerability allows for the improper filling of tlv (type-length-value) entries, which can lead to invalid data being processed during journal replay. The constraints on how tlvs must be filled are not consistently enforced, potentially allowing uninitialized memory to be written to disk. This could result in data corruption or loss, especially when replaying fast-commit journals created by affected kernels. The issue stems from a design oversight that was not fully implemented in the code, leading to unexpected behavior during journal operations.
How To Fix
No fixed version is published for this vulnerability.
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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
CVE-2022-50428 is a significant vulnerability affecting the Linux kernel's ext4 filesystem, resulting from off-by-one errors in fast-commit block handling. Users are advised to update their systems to the patched version to prevent potential data corruption. Regular monitoring for vulnerabilities using tools like Vulert can help maintain system security.
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FAQ
CVE-2022-50428 is a vulnerability in the Linux kernel that involves off-by-one errors in the handling of fast-commit blocks in the ext4 filesystem.
This vulnerability can lead to data corruption or loss during journal replay operations, especially if uninitialized memory is written to disk.
If you are using Debian versions 11, 12, 13, or 14 with the Linux package prior to version 6.1.4-1, your system may be affected.
You can use Vulert, a tool that monitors open-source vulnerabilities in your software. By uploading your manifest file, you can check for vulnerabilities without needing to access the code.
While there are no specific workarounds, it is crucial to plan for an update as soon as possible to mitigate risks associated with this vulnerability.
References
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