Answer in brief
CVE-2026-31452 records a High severity (CVSS 7.8) vulnerability in ext4: convert inline data to extents when truncate exceeds inline size. 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-2026-31452 records a High severity (CVSS 7.8) vulnerability in ext4: convert inline data to extents when truncate exceeds inline size. 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 | >=67cf5b09a46f72e048501b84996f2f77bc42e947 <110d7ef602659ce4d7947c5480f7ca2779696aaf || >=67cf5b09a46f72e048501b84996f2f77bc42e947 <f53a5d9f32924bc2a810d2df243b7714da58b636 || >=67cf5b09a46f72e048501b84996f2f77bc42e947 <c047332be7195833a5c5126816c2502df8269fe4 || >=67cf5b09a46f72e048501b84996f2f77bc42e947 <699bac4d4c951974d55b045c983d1de777215949 || >=67cf5b09a46f72e048501b84996f2f77bc42e947 <7920dcc571cef3d8aa9ee109c136125d61d41669 || >=67cf5b09a46f72e048501b84996f2f77bc42e947 <93cb2d103e5c707de0f7ad58a39b7f0fddc27aa6 || >=67cf5b09a46f72e048501b84996f2f77bc42e947 <07c1a31af18290054da3d18221b8bf58983c5d3a || >=67cf5b09a46f72e048501b84996f2f77bc42e947 <ed9356a30e59c7cc3198e7fc46cfedf3767b9b17 | 110d7ef602659ce4d7947c5480f7ca2779696aaf, f53a5d9f32924bc2a810d2df243b7714da58b636, c047332be7195833a5c5126816c2502df8269fe4, 699bac4d4c951974d55b045c983d1de777215949, 7920dcc571cef3d8aa9ee109c136125d61d41669, 93cb2d103e5c707de0f7ad58a39b7f0fddc27aa6, 07c1a31af18290054da3d18221b8bf58983c5d3a, ed9356a30e59c7cc3198e7fc46cfedf3767b9b17 |
| Linux/Linuxgeneric | 3.8 | 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
Apr 22, 2026
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: ext4: convert inline data to extents when truncate exceeds inline size Add a check in ext4_setattr() to convert files from inline data storage to extent-based storage when truncate() grows the file size beyond the inline capacity. This prevents the filesystem from entering an inconsistent state where the inline data flag is set but the file size exceeds what can be stored inline. Without this fix, the following sequence causes a kernel BUG_ON(): 1. Mount filesystem with inode that has inline flag set and small size 2. truncate(file, 50MB) - grows size but inline flag remains set 3. sendfile() attempts to write data 4. ext4_write_inline_data() hits BUG_ON(write_size > inline_capacity) The crash occurs because ext4_write_inline_data() expects inline storage to accommodate the write, but the actual inline capacity (~60 bytes for i_block + ~96 bytes for xattrs) is far smaller than the file size and write request. The fix checks if the new size from setattr exceeds the inode's actual inline capacity (EXT4_I(inode)->i_inline_size) and converts the file to extent-based storage before proceeding with the size change. This addresses the root cause by ensuring the inline data flag and file size remain consistent during truncate operations.
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 | >=67cf5b09a46f72e048501b84996f2f77bc42e947 <110d7ef602659ce4d7947c5480f7ca2779696aaf || >=67cf5b09a46f72e048501b84996f2f77bc42e947 <f53a5d9f32924bc2a810d2df243b7714da58b636 || >=67cf5b09a46f72e048501b84996f2f77bc42e947 <c047332be7195833a5c5126816c2502df8269fe4 || >=67cf5b09a46f72e048501b84996f2f77bc42e947 <699bac4d4c951974d55b045c983d1de777215949 || >=67cf5b09a46f72e048501b84996f2f77bc42e947 <7920dcc571cef3d8aa9ee109c136125d61d41669 || >=67cf5b09a46f72e048501b84996f2f77bc42e947 <93cb2d103e5c707de0f7ad58a39b7f0fddc27aa6 || >=67cf5b09a46f72e048501b84996f2f77bc42e947 <07c1a31af18290054da3d18221b8bf58983c5d3a || >=67cf5b09a46f72e048501b84996f2f77bc42e947 <ed9356a30e59c7cc3198e7fc46cfedf3767b9b17 | 110d7ef602659ce4d7947c5480f7ca2779696aaf, f53a5d9f32924bc2a810d2df243b7714da58b636, c047332be7195833a5c5126816c2502df8269fe4, 699bac4d4c951974d55b045c983d1de777215949, 7920dcc571cef3d8aa9ee109c136125d61d41669, 93cb2d103e5c707de0f7ad58a39b7f0fddc27aa6, 07c1a31af18290054da3d18221b8bf58983c5d3a, ed9356a30e59c7cc3198e7fc46cfedf3767b9b17 |
| Linux/Linuxgeneric | 3.8 | 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
Apr 22, 2026
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: ext4: convert inline data to extents when truncate exceeds inline size Add a check in ext4_setattr() to convert files from inline data storage to extent-based storage when truncate() grows the file size beyond the inline capacity. This prevents the filesystem from entering an inconsistent state where the inline data flag is set but the file size exceeds what can be stored inline. Without this fix, the following sequence causes a kernel BUG_ON(): 1. Mount filesystem with inode that has inline flag set and small size 2. truncate(file, 50MB) - grows size but inline flag remains set 3. sendfile() attempts to write data 4. ext4_write_inline_data() hits BUG_ON(write_size > inline_capacity) The crash occurs because ext4_write_inline_data() expects inline storage to accommodate the write, but the actual inline capacity (~60 bytes for i_block + ~96 bytes for xattrs) is far smaller than the file size and write request. The fix checks if the new size from setattr exceeds the inode's actual inline capacity (EXT4_I(inode)->i_inline_size) and converts the file to extent-based storage before proceeding with the size change. This addresses the root cause by ensuring the inline data flag and file size remain consistent during truncate operations.
Quoted source text, attributed separately from HOL analysis.