netfilter: ipset: Fix oversized kvmalloc() calls

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-2021-1001558: netfilter: ipset: Fix oversized kvmalloc() calls. Affects Kernel versions < c4bc456cb5b028e6a2a63e5d54b9f08e827c0504. No fix is published. How to fix ↓

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Background

The netfilter package is a part of the Linux Kernel ecosystem and provides a framework for packet filtering and network address translation. It includes various components, including ipset, which is a framework for managing large sets of IP addresses, ports, and other network identifiers. The ipset component allows efficient matching and manipulation of these sets. However, a vulnerability has been identified in ipset that involves oversized kvmalloc() calls.

Vulnerability Detail

The vulnerability in ipset arises from the usage of oversized kvmalloc() calls. This can lead to memory allocation failures and potential memory corruption issues. An attacker could potentially exploit this vulnerability to cause a denial-of-service (DoS) condition or execute arbitrary code with kernel privileges. The impact and attack plausibility of this vulnerability have not yet been proven.

How To Fix

No fixed version is published for this vulnerability.

The vulnerability has been fixed in Linux Kernel version v4.19.209 by commit c4bc456cb5b028e6a2a63e5d54b9f08e827c0504. To fix the vulnerability, it is recommended to update the Linux Kernel to version v4.19.209 or later.

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Workaround

No specific workaround has been mentioned for this vulnerability.

Conclusion

The netfilter ipset vulnerability involving oversized kvmalloc() calls can potentially lead to memory allocation failures and memory corruption. It is recommended to update the Linux Kernel to version v4.19.209 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.

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