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Review reviewHigh

CVE-2025-38704

Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP

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 condit...

CVSS
7.8
EPSS
0.17%
6.20% percentile
CISA KEV
Not listed
Published
2025.09.05
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.17%
Technical severityCVSS 7.8

Vulnerability overview

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 condit...

Affected product and versions

Product
Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
Affected versions
>= 3a5761dc025da47960755ac64d9fbf1c32e8cd80 < b097ae798298885695c339d390b48b4e39619fa7, >= 3a5761dc025da47960755ac64d9fbf1c32e8cd80 < 3da45ec1e485a1a5ad31fe9ddd467c7ee5ae4ef9, >= 3a5761dc025da47960755ac64d9fbf1c32e8cd80 < cce3d027227c69e85896af9fbc6fa9af5c68f067, >= 3a5761dc025da47960755ac64d9fbf1c32e8cd80 < 1c951683a720b17c9ecaad1932bc95b29044611f, >= 3a5761dc025da47960755ac64d9fbf1c32e8cd80 < 9b5ec8e6b31755288a07b3abeeab8cd38e9d3c9d, >= 3a5761dc025da47960755ac64d9fbf1c32e8cd80 < 1bba3900ca18bdae28d1b9fa10f16a8f8cb2ada1, >= 6.0, >= V3.1.6, >= V3.1.5, < 6.12.43, >= 6.13 < 6.15.11, >= 6.16 < 6.16.2
Fixed versions
6.12.43, 6.15.11, 6.16.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2025-38704 — Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | SECUFOCUS NOW