Answer in brief
CVE-2025-21745 records a Medium severity (CVSS 5.5) vulnerability in blk-cgroup: Fix class @block_class's subsystem refcount leakage. 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-2025-21745 records a Medium severity (CVSS 5.5) vulnerability in blk-cgroup: Fix class @block_class's subsystem refcount leakage. 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 5.5. 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 | >=ef45fe470e1e5410db4af87abc5d5055427945ac <ffb494f1e7a047bd7a41b13796fcfb08fe5beafb || >=ef45fe470e1e5410db4af87abc5d5055427945ac <38287f779b34dfe959b4b681e909f2d3d52b88be || >=ef45fe470e1e5410db4af87abc5d5055427945ac <431b6ef2714be4d5babb802114987541a88b43b0 || >=ef45fe470e1e5410db4af87abc5d5055427945ac <993121481b5a87829f1e8163f47158b72679f309 || >=ef45fe470e1e5410db4af87abc5d5055427945ac <2ce09aabe009453d641a2ceb79e6461a2d4f3876 || >=ef45fe470e1e5410db4af87abc5d5055427945ac <67c7f213e052b1aa6caba4a7e25e303bc6997126 || >=ef45fe470e1e5410db4af87abc5d5055427945ac <d1248436cbef1f924c04255367ff4845ccd9025e | ffb494f1e7a047bd7a41b13796fcfb08fe5beafb, 38287f779b34dfe959b4b681e909f2d3d52b88be, 431b6ef2714be4d5babb802114987541a88b43b0, 993121481b5a87829f1e8163f47158b72679f309, 2ce09aabe009453d641a2ceb79e6461a2d4f3876, 67c7f213e052b1aa6caba4a7e25e303bc6997126, d1248436cbef1f924c04255367ff4845ccd9025e |
| Linux/Linuxgeneric | 5.9 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
Published upstream
Feb 27, 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: blk-cgroup: Fix class @block_class's subsystem refcount leakage blkcg_fill_root_iostats() iterates over @block_class's devices by class_dev_iter_(init|next)(), but does not end iterating with class_dev_iter_exit(), so causes the class's subsystem refcount leakage. Fix by ending the iterating with class_dev_iter_exit().
Quoted source text, attributed separately from HOL analysis.
CVSS is 5.5. 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 | >=ef45fe470e1e5410db4af87abc5d5055427945ac <ffb494f1e7a047bd7a41b13796fcfb08fe5beafb || >=ef45fe470e1e5410db4af87abc5d5055427945ac <38287f779b34dfe959b4b681e909f2d3d52b88be || >=ef45fe470e1e5410db4af87abc5d5055427945ac <431b6ef2714be4d5babb802114987541a88b43b0 || >=ef45fe470e1e5410db4af87abc5d5055427945ac <993121481b5a87829f1e8163f47158b72679f309 || >=ef45fe470e1e5410db4af87abc5d5055427945ac <2ce09aabe009453d641a2ceb79e6461a2d4f3876 || >=ef45fe470e1e5410db4af87abc5d5055427945ac <67c7f213e052b1aa6caba4a7e25e303bc6997126 || >=ef45fe470e1e5410db4af87abc5d5055427945ac <d1248436cbef1f924c04255367ff4845ccd9025e | ffb494f1e7a047bd7a41b13796fcfb08fe5beafb, 38287f779b34dfe959b4b681e909f2d3d52b88be, 431b6ef2714be4d5babb802114987541a88b43b0, 993121481b5a87829f1e8163f47158b72679f309, 2ce09aabe009453d641a2ceb79e6461a2d4f3876, 67c7f213e052b1aa6caba4a7e25e303bc6997126, d1248436cbef1f924c04255367ff4845ccd9025e |
| Linux/Linuxgeneric | 5.9 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
Published upstream
Feb 27, 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: blk-cgroup: Fix class @block_class's subsystem refcount leakage blkcg_fill_root_iostats() iterates over @block_class's devices by class_dev_iter_(init|next)(), but does not end iterating with class_dev_iter_exit(), so causes the class's subsystem refcount leakage. Fix by ending the iterating with class_dev_iter_exit().
Quoted source text, attributed separately from HOL analysis.