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CVE-2025-21768

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: fix dst ref loops in rpl, seg6 and ioam6 lwtunnels Some lwtunnels have a dst cache for post-transformation dst.

Published Feb 27, 2025CWE-401EPSS 0.21%

Overview

CVE-2025-21768 is a medium-severity vulnerability. It was published on February 27, 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:

net: ipv6: fix dst ref loops in rpl, seg6 and ioam6 lwtunnels

Some lwtunnels have a dst cache for post-transformation dst.

If the packet destination did not change we may end up recording

a reference to the lwtunnel in its own cache, and the lwtunnel

state will never be freed.

Discovered by the ioam6.sh test, kmemleak was recently fixed

to catch per-cpu memory leaks. I'm not sure if rpl and seg6

can actually hit this, but in principle I don't see why not.

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/4c0f200c7d06fedddde82209c099014d63f4a6c0Refgit.kernel.org/stable/c/5ab11a4e219e93b8b31a27f8ec98d42afadd8b7aRefgit.kernel.org/stable/c/92191dd1073088753821b862b791dcc83e558e07

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21768?

CVE-2025-21768 is a medium-severity vulnerability. It was published on February 27, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-21768?

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-2025-21768?

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-2025-21768?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21768 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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