Answer in brief
CVE-2025-38704 records a High severity (CVSS 7.8) vulnerability in rcu/nocb: Fix possible invalid rdp's->nocb_cb_kthread pointer access. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2025-38704 records a High severity (CVSS 7.8) vulnerability in rcu/nocb: Fix possible invalid rdp's->nocb_cb_kthread pointer access. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=3a5761dc025da47960755ac64d9fbf1c32e8cd80 <b097ae798298885695c339d390b48b4e39619fa7 || >=3a5761dc025da47960755ac64d9fbf1c32e8cd80 <3da45ec1e485a1a5ad31fe9ddd467c7ee5ae4ef9 || >=3a5761dc025da47960755ac64d9fbf1c32e8cd80 <cce3d027227c69e85896af9fbc6fa9af5c68f067 || >=3a5761dc025da47960755ac64d9fbf1c32e8cd80 <1c951683a720b17c9ecaad1932bc95b29044611f || >=3a5761dc025da47960755ac64d9fbf1c32e8cd80 <9b5ec8e6b31755288a07b3abeeab8cd38e9d3c9d || >=3a5761dc025da47960755ac64d9fbf1c32e8cd80 <1bba3900ca18bdae28d1b9fa10f16a8f8cb2ada1 | b097ae798298885695c339d390b48b4e39619fa7, 3da45ec1e485a1a5ad31fe9ddd467c7ee5ae4ef9, cce3d027227c69e85896af9fbc6fa9af5c68f067, 1c951683a720b17c9ecaad1932bc95b29044611f, 9b5ec8e6b31755288a07b3abeeab8cd38e9d3c9d, 1bba3900ca18bdae28d1b9fa10f16a8f8cb2ada1 |
| Linux/Linuxgeneric | 6.0 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
Published upstream
Sep 4, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
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.
Quoted source text, attributed separately from HOL analysis.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=3a5761dc025da47960755ac64d9fbf1c32e8cd80 <b097ae798298885695c339d390b48b4e39619fa7 || >=3a5761dc025da47960755ac64d9fbf1c32e8cd80 <3da45ec1e485a1a5ad31fe9ddd467c7ee5ae4ef9 || >=3a5761dc025da47960755ac64d9fbf1c32e8cd80 <cce3d027227c69e85896af9fbc6fa9af5c68f067 || >=3a5761dc025da47960755ac64d9fbf1c32e8cd80 <1c951683a720b17c9ecaad1932bc95b29044611f || >=3a5761dc025da47960755ac64d9fbf1c32e8cd80 <9b5ec8e6b31755288a07b3abeeab8cd38e9d3c9d || >=3a5761dc025da47960755ac64d9fbf1c32e8cd80 <1bba3900ca18bdae28d1b9fa10f16a8f8cb2ada1 | b097ae798298885695c339d390b48b4e39619fa7, 3da45ec1e485a1a5ad31fe9ddd467c7ee5ae4ef9, cce3d027227c69e85896af9fbc6fa9af5c68f067, 1c951683a720b17c9ecaad1932bc95b29044611f, 9b5ec8e6b31755288a07b3abeeab8cd38e9d3c9d, 1bba3900ca18bdae28d1b9fa10f16a8f8cb2ada1 |
| Linux/Linuxgeneric | 6.0 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
Published upstream
Sep 4, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
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.
Quoted source text, attributed separately from HOL analysis.