Answer in brief
CVE-2025-38477 records a Unknown severity vulnerability in net/sched: sch_qfq: Fix race condition on qfq_aggregate. 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 1518F-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-2025-38477 records a Unknown severity vulnerability in net/sched: sch_qfq: Fix race condition on qfq_aggregate. 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 1518F-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.
A CVSS score is not reported in the current record. 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 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=462dbc9101acd38e92eda93c0726857517a24bbd <aa7a22c4d678bf649fd3a1d27debec583563414d || >=462dbc9101acd38e92eda93c0726857517a24bbd <d841aa5518508ab195b6781ad0d73ee378d713dd || >=462dbc9101acd38e92eda93c0726857517a24bbd <c6df794000147a3a02f79984aada4ce83f8d0a1e || >=462dbc9101acd38e92eda93c0726857517a24bbd <466e10194ab81caa2ee6a332d33ba16bcceeeba6 || >=462dbc9101acd38e92eda93c0726857517a24bbd <fbe48f06e64134dfeafa89ad23387f66ebca3527 || >=462dbc9101acd38e92eda93c0726857517a24bbd <a6d735100f602c830c16d69fb6d780eebd8c9ae1 || >=462dbc9101acd38e92eda93c0726857517a24bbd <c000a3a330d97f6c073ace5aa5faf94b9adb4b79 || >=462dbc9101acd38e92eda93c0726857517a24bbd <5e28d5a3f774f118896aec17a3a20a9c5c9dfc64 | aa7a22c4d678bf649fd3a1d27debec583563414d, d841aa5518508ab195b6781ad0d73ee378d713dd, c6df794000147a3a02f79984aada4ce83f8d0a1e, 466e10194ab81caa2ee6a332d33ba16bcceeeba6, fbe48f06e64134dfeafa89ad23387f66ebca3527, a6d735100f602c830c16d69fb6d780eebd8c9ae1, c000a3a330d97f6c073ace5aa5faf94b9adb4b79, 5e28d5a3f774f118896aec17a3a20a9c5c9dfc64 |
| Linux/Linuxgeneric | 3.8 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
Published upstream
Jul 28, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: Fix race condition on qfq_aggregate A race condition can occur when 'agg' is modified in qfq_change_agg (called during qfq_enqueue) while other threads access it concurrently. For example, qfq_dump_class may trigger a NULL dereference, and qfq_delete_class may cause a use-after-free. This patch addresses the issue by: 1. Moved qfq_destroy_class into the critical section. 2. Added sch_tree_lock protection to qfq_dump_class and qfq_dump_class_stats.
Quoted source text, attributed separately from HOL analysis.
A CVSS score is not reported in the current record. 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 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=462dbc9101acd38e92eda93c0726857517a24bbd <aa7a22c4d678bf649fd3a1d27debec583563414d || >=462dbc9101acd38e92eda93c0726857517a24bbd <d841aa5518508ab195b6781ad0d73ee378d713dd || >=462dbc9101acd38e92eda93c0726857517a24bbd <c6df794000147a3a02f79984aada4ce83f8d0a1e || >=462dbc9101acd38e92eda93c0726857517a24bbd <466e10194ab81caa2ee6a332d33ba16bcceeeba6 || >=462dbc9101acd38e92eda93c0726857517a24bbd <fbe48f06e64134dfeafa89ad23387f66ebca3527 || >=462dbc9101acd38e92eda93c0726857517a24bbd <a6d735100f602c830c16d69fb6d780eebd8c9ae1 || >=462dbc9101acd38e92eda93c0726857517a24bbd <c000a3a330d97f6c073ace5aa5faf94b9adb4b79 || >=462dbc9101acd38e92eda93c0726857517a24bbd <5e28d5a3f774f118896aec17a3a20a9c5c9dfc64 | aa7a22c4d678bf649fd3a1d27debec583563414d, d841aa5518508ab195b6781ad0d73ee378d713dd, c6df794000147a3a02f79984aada4ce83f8d0a1e, 466e10194ab81caa2ee6a332d33ba16bcceeeba6, fbe48f06e64134dfeafa89ad23387f66ebca3527, a6d735100f602c830c16d69fb6d780eebd8c9ae1, c000a3a330d97f6c073ace5aa5faf94b9adb4b79, 5e28d5a3f774f118896aec17a3a20a9c5c9dfc64 |
| Linux/Linuxgeneric | 3.8 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
Published upstream
Jul 28, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: Fix race condition on qfq_aggregate A race condition can occur when 'agg' is modified in qfq_change_agg (called during qfq_enqueue) while other threads access it concurrently. For example, qfq_dump_class may trigger a NULL dereference, and qfq_delete_class may cause a use-after-free. This patch addresses the issue by: 1. Moved qfq_destroy_class into the critical section. 2. Added sch_tree_lock protection to qfq_dump_class and qfq_dump_class_stats.
Quoted source text, attributed separately from HOL analysis.