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CVE-2026-23138

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: tracing: Add recursion protection in kernel stack trace recording A bug was reported about an infinite recursion caused by trac…

Published Feb 14, 2026EPSS 0.14%

Overview

CVE-2026-23138 is a medium-severity vulnerability. It was published on February 14, 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 recursion protection in kernel stack trace recording

A bug was reported about an infinite recursion caused by tracing the rcu

events with the kernel stack trace trigger enabled. The stack trace code

called back into RCU which then called the stack trace again.

Expand the ftrace recursion protection to add a set of bits to protect

events from recursion. Each bit represents the context that the event is

in (normal, softirq, interrupt and NMI).

Have the stack trace code use the interrupt context to protect against

recursion.

Note, the bug showed an issue in both the RCU code as well as the tracing

stacktrace code. This only handles the tracing stack trace side of the

bug. The RCU fix will be handled separately.

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/19e18e6dabb1bbba76d2809ca7d8ae9e1f5975feRefgit.kernel.org/stable/c/5b7f91acffd2c4c000971553d22efa1e1bb4feaeRefgit.kernel.org/stable/c/5f1ef0dfcb5b7f4a91a9b0e0ba533efd9f7e2cdbRefgit.kernel.org/stable/c/9b03768037d91ce727effb1c5d92d2c7781bf692

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23138?

CVE-2026-23138 is a medium-severity vulnerability. It was published on February 14, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-23138?

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-2026-23138?

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-2026-23138?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23138 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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