Vulnerability in Kernel Package: bpf: Add oversize check before call kvcalloc()

Kernel Updated 02 Oct 2025

Summary

19/10/2021

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2021-1001607: bpf: Add oversize check before call kvcalloc(). Affects Kernel versions < 93937596e0652d50973f9dc944fea1694ac8cdfd. No fix is published. How to fix ↓

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Background

The Kernel package is a fundamental component of the Linux operating system, responsible for managing system resources and facilitating communication between hardware and software. It provides essential functionalities such as process management, memory management, and device drivers. The vulnerability in question affects the Kernel package and specifically the bpf (Berkeley Packet Filter) subsystem. The bpf subsystem allows users to define and attach filters to various network interfaces, enabling efficient packet filtering and manipulation. However, a flaw in the implementation of the kvcalloc() function within the bpf subsystem can lead to potential security vulnerabilities.

Vulnerability Detail

The vulnerability arises from a missing oversize check before calling the kvcalloc() function. This oversight can result in memory allocation beyond the intended size, potentially leading to buffer overflows or other memory-related issues. While the impact and attack plausibility of this vulnerability have not been proven, it is crucial to address it to mitigate potential risks. The vulnerability has been fixed in Linux Kernel version v5.4.150 by commit 93937596e0652d50973f9dc944fea1694ac8cdfd.

How To Fix

No fixed version is published for this vulnerability.

To fix this vulnerability, it is recommended to update the Kernel package to version v5.4.150 or later. This update includes the necessary patch that adds the oversize check before calling the kvcalloc() function, ensuring proper memory allocation and mitigating the vulnerability.

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Workaround

As this vulnerability has been fixed in the latest version of the Kernel package, there is no specific workaround available. It is advised to update to the patched version to address the issue.

Conclusion

The vulnerability in the Kernel package's bpf subsystem, which involved a missing oversize check before calling the kvcalloc() function, has been addressed in version v5.4.150. It is crucial to update to this version or later to ensure proper memory allocation and mitigate potential risks. For further support on vulnerability remediation, please contact DevNack.com.

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