Answer in brief
CVE-2025-38685 records a Unknown severity vulnerability in fbdev: Fix vmalloc out-of-bounds write in fast_imageblit. 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-2025-38685 records a Unknown severity vulnerability in fbdev: Fix vmalloc out-of-bounds write in fast_imageblit. 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.
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 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 | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <078e62bffca4b7e72e8f3550eb063ab981c36c7a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4c4d7ddaf1d43780b106bedc692679f965dc5a3a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <27b118aebdd84161c8ff5ce49d9d536f2af10754 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ed9b8e5016230868c8d813d9179523f729fec8c6 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <56701bf9eeb63219e378cb7fcbd066ea4eaeeb50 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cfec17721265e72e50cc69c6004fe3475cd38df2 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <af0db3c1f898144846d4c172531a199bb3ca375d | 078e62bffca4b7e72e8f3550eb063ab981c36c7a, 4c4d7ddaf1d43780b106bedc692679f965dc5a3a, 27b118aebdd84161c8ff5ce49d9d536f2af10754, ed9b8e5016230868c8d813d9179523f729fec8c6, 56701bf9eeb63219e378cb7fcbd066ea4eaeeb50, cfec17721265e72e50cc69c6004fe3475cd38df2, af0db3c1f898144846d4c172531a199bb3ca375d |
| Linux/Linuxgeneric | 2.6.12 | 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 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| 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
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: fbdev: Fix vmalloc out-of-bounds write in fast_imageblit This issue triggers when a userspace program does an ioctl FBIOPUT_CON2FBMAP by passing console number and frame buffer number. Ideally this maps console to frame buffer and updates the screen if console is visible. As part of mapping it has to do resize of console according to frame buffer info. if this resize fails and returns from vc_do_resize() and continues further. At this point console and new frame buffer are mapped and sets display vars. Despite failure still it continue to proceed updating the screen at later stages where vc_data is related to previous frame buffer and frame buffer info and display vars are mapped to new frame buffer and eventully leading to out-of-bounds write in fast_imageblit(). This bheviour is excepted only when fg_console is equal to requested console which is a visible console and updates screen with invalid struct references in fbcon_putcs().
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 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 | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <078e62bffca4b7e72e8f3550eb063ab981c36c7a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4c4d7ddaf1d43780b106bedc692679f965dc5a3a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <27b118aebdd84161c8ff5ce49d9d536f2af10754 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ed9b8e5016230868c8d813d9179523f729fec8c6 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <56701bf9eeb63219e378cb7fcbd066ea4eaeeb50 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cfec17721265e72e50cc69c6004fe3475cd38df2 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <af0db3c1f898144846d4c172531a199bb3ca375d | 078e62bffca4b7e72e8f3550eb063ab981c36c7a, 4c4d7ddaf1d43780b106bedc692679f965dc5a3a, 27b118aebdd84161c8ff5ce49d9d536f2af10754, ed9b8e5016230868c8d813d9179523f729fec8c6, 56701bf9eeb63219e378cb7fcbd066ea4eaeeb50, cfec17721265e72e50cc69c6004fe3475cd38df2, af0db3c1f898144846d4c172531a199bb3ca375d |
| Linux/Linuxgeneric | 2.6.12 | 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 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| 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
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: fbdev: Fix vmalloc out-of-bounds write in fast_imageblit This issue triggers when a userspace program does an ioctl FBIOPUT_CON2FBMAP by passing console number and frame buffer number. Ideally this maps console to frame buffer and updates the screen if console is visible. As part of mapping it has to do resize of console according to frame buffer info. if this resize fails and returns from vc_do_resize() and continues further. At this point console and new frame buffer are mapped and sets display vars. Despite failure still it continue to proceed updating the screen at later stages where vc_data is related to previous frame buffer and frame buffer info and display vars are mapped to new frame buffer and eventully leading to out-of-bounds write in fast_imageblit(). This bheviour is excepted only when fg_console is equal to requested console which is a visible console and updates screen with invalid struct references in fbcon_putcs().
Quoted source text, attributed separately from HOL analysis.