Vulnerability in Linux Kernel: mmmremap.c

Kernel Updated 02 Oct 2025

Summary

24/04/2022

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2022-1001676: mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0). Affects Kernel versions < a04cb99c5d4668fe3f5c0e5b6da1cecd34c3f219. 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 providing essential functionality. It is an open-source project that powers a wide range of devices, from servers to embedded systems. The mmmremap.c file is part of the kernel's memory management subsystem and is used for handling memory remapping operations. This vulnerability in mmmremap.c can lead to unnecessary invalidation of memory ranges when performing mremap operations with an old size of 0.

Vulnerability Detail

The vulnerability in mmmremap.c arises from the unnecessary invalidation of memory ranges during mremap operations with an old size of 0. This can result in performance degradation and unnecessary overhead. While the impact and attack plausibility have not been proven, it is important to address this issue to ensure optimal system performance and resource utilization. The vulnerability has been fixed in Linux Kernel version v5.15.34 by commit a04cb99c5d4668fe3f5c0e5b6da1cecd34c3f219.

How To Fix

No fixed version is published for this vulnerability.

To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.15.34 or later. This can be done by obtaining the latest kernel source code from the official Linux Kernel repository (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/) and compiling it for the target system. Alternatively, users can wait for their Linux distribution to provide an updated package containing the fixed version of the kernel.

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Workaround

There is no specific workaround mentioned for this vulnerability. The recommended approach is to apply the fix by updating the Linux Kernel to the patched version.

Conclusion

The vulnerability in mmmremap.c of the Linux Kernel can result in unnecessary invalidation of memory ranges during mremap operations with an old size of 0. While the impact and attack plausibility have not been proven, it is advisable to update the Linux Kernel to version v5.15.34 or later to ensure optimal system performance and resource utilization. For further support on vulnerability remediation, you can reach out to DevNack.com.

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