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CVE-2026-23309

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: tracing: Add NULL pointer check to trigger_data_free() If trigger_data_alloc() fails and returns NULL, event_hist_trigger_parse…

Published Mar 25, 2026CWE-476EPSS 0.12%

Overview

CVE-2026-23309 is a medium-severity vulnerability. It was published on March 25, 2026 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:

tracing: Add NULL pointer check to trigger_data_free()

If trigger_data_alloc() fails and returns NULL, event_hist_trigger_parse()

jumps to the out_free error path. While kfree() safely handles a NULL

pointer, trigger_data_free() does not. This causes a NULL pointer

dereference in trigger_data_free() when evaluating

data->cmd_ops->set_filter.

Fix the problem by adding a NULL pointer check to trigger_data_free().

The problem was found by an experimental code review agent based on

gemini-3.1-pro while reviewing backports into v6.18.y.

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/13dcd9269e225e4c4ceabdaeebe2ce4661b54c6eRefgit.kernel.org/stable/c/2ce8ece5a78da67834db7728edc801889a64f643Refgit.kernel.org/stable/c/42b380f97d65e76e7b310facd525f730272daf57Refgit.kernel.org/stable/c/457965c13f0837a289c9164b842d0860133f6274Refgit.kernel.org/stable/c/477469223b2b840f436ce204333de87cb17e5d93Refgit.kernel.org/stable/c/59c15b9cc453b74beb9f04c6c398717e73612dc3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23309?

CVE-2026-23309 is a medium-severity vulnerability. It was published on March 25, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-23309?

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-2026-23309?

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-2026-23309?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23309 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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