Answer in brief
CVE-2025-40022 records a Unknown severity vulnerability in crypto: af_alg - Fix incorrect boolean values in af_alg_ctx. 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-2025-40022 records a Unknown severity vulnerability in crypto: af_alg - Fix incorrect boolean values in af_alg_ctx. 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.
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 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 | >=0f28c4adbc4a97437874c9b669fd7958a8c6d6ce <3a21698ace915a445bce2d0dcfc84b6d2199baf7 || >=e4c1ec11132ec466f7362a95f36a506ce4dc08c9 <d382d6daf0184490f366562469a5673f65ee2662 || >=1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8 <54506c6335690f4ef1b9f154e34f5a604c72c1ed || >=7c4491b5644e3a3708f3dbd7591be0a570135b84 <8703940bd30b5ad94408d28d7192db2491cd3592 || >=9aee87da5572b3a14075f501752e209801160d3d <316b090c2fee964c307a634fecc7df269664b158 || >=45bcf60fe49b37daab1acee57b27211ad1574042 <fbe96bd25423e61273d8831e995260b429d850b6 || >=1b34cbbf4f011a121ef7b2d7d6e6920a036d5285 <d0ca0df179c4b21e2a6c4a4fb637aa8fa14575cb | 3a21698ace915a445bce2d0dcfc84b6d2199baf7, d382d6daf0184490f366562469a5673f65ee2662, 54506c6335690f4ef1b9f154e34f5a604c72c1ed, 8703940bd30b5ad94408d28d7192db2491cd3592, 316b090c2fee964c307a634fecc7df269664b158, fbe96bd25423e61273d8831e995260b429d850b6, d0ca0df179c4b21e2a6c4a4fb637aa8fa14575cb |
| Linux/Linuxgeneric | >=6.1.154 <6.1.155 || >=6.6.108 <6.6.109 || >=6.12.49 <6.12.50 || >=6.16.9 <6.16.10 | 6.1.155, 6.6.109, 6.12.50, 6.16.10 |
| 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
Oct 24, 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: crypto: af_alg - Fix incorrect boolean values in af_alg_ctx Commit 1b34cbbf4f01 ("crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg") changed some fields from bool to 1-bit bitfields of type u32. However, some assignments to these fields, specifically 'more' and 'merge', assign values greater than 1. These relied on C's implicit conversion to bool, such that zero becomes false and nonzero becomes true. With a 1-bit bitfields of type u32 instead, mod 2 of the value is taken instead, resulting in 0 being assigned in some cases when 1 was intended. Fix this by restoring the bool type.
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 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 | >=0f28c4adbc4a97437874c9b669fd7958a8c6d6ce <3a21698ace915a445bce2d0dcfc84b6d2199baf7 || >=e4c1ec11132ec466f7362a95f36a506ce4dc08c9 <d382d6daf0184490f366562469a5673f65ee2662 || >=1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8 <54506c6335690f4ef1b9f154e34f5a604c72c1ed || >=7c4491b5644e3a3708f3dbd7591be0a570135b84 <8703940bd30b5ad94408d28d7192db2491cd3592 || >=9aee87da5572b3a14075f501752e209801160d3d <316b090c2fee964c307a634fecc7df269664b158 || >=45bcf60fe49b37daab1acee57b27211ad1574042 <fbe96bd25423e61273d8831e995260b429d850b6 || >=1b34cbbf4f011a121ef7b2d7d6e6920a036d5285 <d0ca0df179c4b21e2a6c4a4fb637aa8fa14575cb | 3a21698ace915a445bce2d0dcfc84b6d2199baf7, d382d6daf0184490f366562469a5673f65ee2662, 54506c6335690f4ef1b9f154e34f5a604c72c1ed, 8703940bd30b5ad94408d28d7192db2491cd3592, 316b090c2fee964c307a634fecc7df269664b158, fbe96bd25423e61273d8831e995260b429d850b6, d0ca0df179c4b21e2a6c4a4fb637aa8fa14575cb |
| Linux/Linuxgeneric | >=6.1.154 <6.1.155 || >=6.6.108 <6.6.109 || >=6.12.49 <6.12.50 || >=6.16.9 <6.16.10 | 6.1.155, 6.6.109, 6.12.50, 6.16.10 |
| 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
Oct 24, 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: crypto: af_alg - Fix incorrect boolean values in af_alg_ctx Commit 1b34cbbf4f01 ("crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg") changed some fields from bool to 1-bit bitfields of type u32. However, some assignments to these fields, specifically 'more' and 'merge', assign values greater than 1. These relied on C's implicit conversion to bool, such that zero becomes false and nonzero becomes true. With a 1-bit bitfields of type u32 instead, mod 2 of the value is taken instead, resulting in 0 being assigned in some cases when 1 was intended. Fix this by restoring the bool type.
Quoted source text, attributed separately from HOL analysis.