Vulnerability in mm/filemap Package: Handling of THPs in generic_file_buffered_read()

Kernel Updated 02 Oct 2025

Summary

18/03/2022

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2022-1000821: mm/filemap: Fix handling of THPs in generic_file_buffered_read(). Affects Kernel versions >= cbd59c48ae2bcadc4a7599c29cf32fd3f9b78251, < f89903ae99bd02379e8b84d487ce302f122c4ef1. No fix is published. How to fix ↓

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Background

The mm/filemap package is a component of the Linux Kernel, which is responsible for managing memory and file mapping. It provides functions for reading and writing data from/to files. The generic_file_buffered_read() function is used for buffered file reads, where data is read into a page cache before being returned to the caller. However, a vulnerability has been discovered in the handling of Transparent Huge Pages (THPs) within this function.

Vulnerability Detail

The vulnerability arises from a flaw in the handling of THPs in the generic_file_buffered_read() function of the mm/filemap package. THPs are large memory pages that can improve performance by reducing the overhead of managing smaller pages. However, the code in question does not properly handle THPs, potentially leading to memory corruption or other security issues. An attacker may be able to exploit this vulnerability to gain unauthorized access to sensitive information or execute arbitrary code.

How To Fix

No fixed version is published for this vulnerability.

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Workaround

As a workaround, users can disable Transparent Huge Pages (THPs) by setting the 'transparent_hugepage' kernel parameter to 'never'. This can be done by adding 'transparent_hugepage=never' to the kernel command line in the bootloader configuration. However, disabling THPs may impact system performance, so it is recommended to apply the official fix as soon as possible.

Conclusion

In conclusion, a vulnerability has been discovered in the mm/filemap package of the Linux Kernel, specifically in the handling of Transparent Huge Pages (THPs) within the generic_file_buffered_read() function. This vulnerability could potentially allow an attacker to gain unauthorized access to sensitive information or execute arbitrary code. It is recommended to update the Linux Kernel to version v5.15.26 or later to fix this issue. Alternatively, users can apply a temporary workaround by disabling THPs, but it is advised to apply the official fix as soon as possible. For further support on vulnerability remediation, please contact DevNack.com.

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