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CVE-2025-21648

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: clamp maximum hashtable size to INT_MAX Use INT_MAX as maximum size for the conntrack hashtable.

Published Jan 19, 2025EPSS 0.22%

Overview

CVE-2025-21648 is a medium-severity vulnerability. It was published on January 19, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

netfilter: conntrack: clamp maximum hashtable size to INT_MAX

Use INT_MAX as maximum size for the conntrack hashtable. Otherwise, it

is possible to hit WARN_ON_ONCE in __kvmalloc_node_noprof() when

resizing hashtable because __GFP_NOWARN is unset. See:

0708a0afe291 ("mm: Consider __GFP_NOWARN flag for oversized kvmalloc() calls")

Note: hashtable resize is only possible from init_netns.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/5552b4fd44be3393b930434a7845d8d95a2a3c33Refgit.kernel.org/stable/c/a965f7f0ea3ae61b9165bed619d5d6da02c75f80Refgit.kernel.org/stable/c/b1b2353d768f1b80cd7fe045a70adee576b9b338Refgit.kernel.org/stable/c/b541ba7d1f5a5b7b3e2e22dc9e40e18a7d6dbc13Refgit.kernel.org/stable/c/d5807dd1328bbc86e059c5de80d1bbee9d58ca3dRefgit.kernel.org/stable/c/f559357d035877b9d0dcd273e0ff83e18e1d46aaReflists.debian.org/debian-lts-announce/2025/03/msg00001.htmlReflists.debian.org/debian-lts-announce/2025/03/msg00002.htmlRefcert-portal.siemens.com/productcert/html/ssa-019113.htmlRefcert-portal.siemens.com/productcert/html/ssa-265688.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21648?

CVE-2025-21648 is a medium-severity vulnerability. It was published on January 19, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-21648?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-21648?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-21648?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21648 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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