Answer in brief
CVE-2025-39795 records a Medium severity (CVSS 5.5) vulnerability in block: avoid possible overflow for chunk_sectors check in blk_stack_limits(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC CN 4100 (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-2025-39795 records a Medium severity (CVSS 5.5) vulnerability in block: avoid possible overflow for chunk_sectors check in blk_stack_limits(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC CN 4100 (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 CN 4100 (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 | >=22ada802ede89829dd010a317d9b812b7df7111a <418751910044649baa2b424ea31cce3fc4dcc253 || >=22ada802ede89829dd010a317d9b812b7df7111a <8b3ce085b52e674290cbfdd07034e7653ffbe4dc || >=22ada802ede89829dd010a317d9b812b7df7111a <31f2f080898e50cbf2bae62d35f9f2a997547b38 || >=22ada802ede89829dd010a317d9b812b7df7111a <3b9d69f0e68aa6b0acd9791c45d445154a8c66e9 || >=22ada802ede89829dd010a317d9b812b7df7111a <46aa80ef49594ed7de685ecbc673b291e9a2c159 || >=22ada802ede89829dd010a317d9b812b7df7111a <5e276e6ff9aacf8901b9c3265c3cdd2568c9fff2 || >=22ada802ede89829dd010a317d9b812b7df7111a <14beeef4aafecc8a41de534e31fb5be94739392f || >=22ada802ede89829dd010a317d9b812b7df7111a <448dfecc7ff807822ecd47a5c052acedca7d09e8 | 418751910044649baa2b424ea31cce3fc4dcc253, 8b3ce085b52e674290cbfdd07034e7653ffbe4dc, 31f2f080898e50cbf2bae62d35f9f2a997547b38, 3b9d69f0e68aa6b0acd9791c45d445154a8c66e9, 46aa80ef49594ed7de685ecbc673b291e9a2c159, 5e276e6ff9aacf8901b9c3265c3cdd2568c9fff2, 14beeef4aafecc8a41de534e31fb5be94739392f, 448dfecc7ff807822ecd47a5c052acedca7d09e8 |
| Linux/Linuxgeneric | 5.10 | Not reported |
| Siemens/SIMATIC CN 4100generic | >=0 <V5.0 | V5.0 |
| 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/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
Sep 12, 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: block: avoid possible overflow for chunk_sectors check in blk_stack_limits() In blk_stack_limits(), we check that the t->chunk_sectors value is a multiple of the t->physical_block_size value. However, by finding the chunk_sectors value in bytes, we may overflow the unsigned int which holds chunk_sectors, so change the check to be based on sectors.
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 CN 4100 (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 | >=22ada802ede89829dd010a317d9b812b7df7111a <418751910044649baa2b424ea31cce3fc4dcc253 || >=22ada802ede89829dd010a317d9b812b7df7111a <8b3ce085b52e674290cbfdd07034e7653ffbe4dc || >=22ada802ede89829dd010a317d9b812b7df7111a <31f2f080898e50cbf2bae62d35f9f2a997547b38 || >=22ada802ede89829dd010a317d9b812b7df7111a <3b9d69f0e68aa6b0acd9791c45d445154a8c66e9 || >=22ada802ede89829dd010a317d9b812b7df7111a <46aa80ef49594ed7de685ecbc673b291e9a2c159 || >=22ada802ede89829dd010a317d9b812b7df7111a <5e276e6ff9aacf8901b9c3265c3cdd2568c9fff2 || >=22ada802ede89829dd010a317d9b812b7df7111a <14beeef4aafecc8a41de534e31fb5be94739392f || >=22ada802ede89829dd010a317d9b812b7df7111a <448dfecc7ff807822ecd47a5c052acedca7d09e8 | 418751910044649baa2b424ea31cce3fc4dcc253, 8b3ce085b52e674290cbfdd07034e7653ffbe4dc, 31f2f080898e50cbf2bae62d35f9f2a997547b38, 3b9d69f0e68aa6b0acd9791c45d445154a8c66e9, 46aa80ef49594ed7de685ecbc673b291e9a2c159, 5e276e6ff9aacf8901b9c3265c3cdd2568c9fff2, 14beeef4aafecc8a41de534e31fb5be94739392f, 448dfecc7ff807822ecd47a5c052acedca7d09e8 |
| Linux/Linuxgeneric | 5.10 | Not reported |
| Siemens/SIMATIC CN 4100generic | >=0 <V5.0 | V5.0 |
| 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/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
Sep 12, 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: block: avoid possible overflow for chunk_sectors check in blk_stack_limits() In blk_stack_limits(), we check that the t->chunk_sectors value is a multiple of the t->physical_block_size value. However, by finding the chunk_sectors value in bytes, we may overflow the unsigned int which holds chunk_sectors, so change the check to be based on sectors.
Quoted source text, attributed separately from HOL analysis.