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CVE-2025-38704

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: rcu/nocb: Fix possible invalid rdp's->nocb_cb_kthread pointer access In the preparation stage of CPU online, if the correspondi…

Published Sep 4, 2025EPSS 0.18%

Overview

CVE-2025-38704 is a high-severity vulnerability. It was published on September 4, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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:

rcu/nocb: Fix possible invalid rdp's->nocb_cb_kthread pointer access

In the preparation stage of CPU online, if the corresponding

the rdp's->nocb_cb_kthread does not exist, will be created,

there is a situation where the rdp's rcuop kthreads creation fails,

and then de-offload this CPU's rdp, does not assign this CPU's

rdp->nocb_cb_kthread pointer, but this rdp's->nocb_gp_rdp and

rdp's->rdp_gp->nocb_gp_kthread is still valid.

This will cause the subsequent re-offload operation of this offline

CPU, which will pass the conditional check and the kthread_unpark()

will access invalid rdp's->nocb_cb_kthread pointer.

This commit therefore use rdp's->nocb_gp_kthread instead of

rdp_gp's->nocb_gp_kthread for safety check.

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/1bba3900ca18bdae28d1b9fa10f16a8f8cb2ada1Refgit.kernel.org/stable/c/1c951683a720b17c9ecaad1932bc95b29044611fRefgit.kernel.org/stable/c/3da45ec1e485a1a5ad31fe9ddd467c7ee5ae4ef9Refgit.kernel.org/stable/c/9b5ec8e6b31755288a07b3abeeab8cd38e9d3c9dRefgit.kernel.org/stable/c/b097ae798298885695c339d390b48b4e39619fa7Refgit.kernel.org/stable/c/cce3d027227c69e85896af9fbc6fa9af5c68f067Refcert-portal.siemens.com/productcert/html/ssa-019113.htmlRefcert-portal.siemens.com/productcert/html/ssa-082556.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38704?

CVE-2025-38704 is a high-severity vulnerability. It was published on September 4, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-38704?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-38704?

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-2025-38704?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38704 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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