Vulnerability in ext4: fix bug on ext4_es_cache_extent as ext4_split_extent_at failed

Kernel Updated 02 Oct 2025

Summary

24/06/2021

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2021-1000731: ext4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed. Affects Kernel versions < d8116743ef5432336289256b2f7c117299213eb9. No fix is published. How to fix ↓

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Background

The ext4 package is a file system driver for the Linux kernel. It provides support for the fourth extended file system (ext4) and is widely used in Linux distributions. The ext4 file system is known for its performance, scalability, and reliability. However, a vulnerability has been discovered in the ext4_es_cache_extent function, specifically when ext4_split_extent_at fails.

Vulnerability Detail

The vulnerability in ext4 arises from a bug in the ext4_es_cache_extent function, which is triggered when ext4_split_extent_at fails. This bug can potentially lead to various issues, including data corruption, file system crashes, and denial of service. An attacker could exploit this vulnerability to cause a system to become unresponsive or execute arbitrary code. The impact and attack plausibility of this vulnerability have not yet been proven.

How To Fix

No fixed version is published for this vulnerability.

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Workaround

There is no known workaround for this vulnerability. It is essential to apply the fix by updating the Linux Kernel to the recommended version.

Conclusion

The ext4 package in the Linux Kernel is vulnerable to a bug in the ext4_es_cache_extent function. This vulnerability can lead to data corruption, file system crashes, and denial of service. It is crucial to update the Linux Kernel to version v4.14.236 or later to fix this vulnerability. No known workaround is available. For further support on vulnerability remediation, please contact DevNack.com.

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