Answer in brief
CVE-2025-39815 records a Unknown severity vulnerability in RISC-V: KVM: fix stack overrun when loading vlenb. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). 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). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=2fa290372dfe7dd248b1c16f943f273a3e674f22 <c76bf8359188a11f8fd790e5bbd6077894a245cc || >=2fa290372dfe7dd248b1c16f943f273a3e674f22 <6d28659b692a0212f360f8bd8a58712b339f9aac || >=2fa290372dfe7dd248b1c16f943f273a3e674f22 <799766208f09f95677a9ab111b93872d414fbad7 | c76bf8359188a11f8fd790e5bbd6077894a245cc, 6d28659b692a0212f360f8bd8a58712b339f9aac, 799766208f09f95677a9ab111b93872d414fbad7 |
| Linux/Linuxgeneric | 6.8 | Not reported |
Published upstream
Sep 16, 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: RISC-V: KVM: fix stack overrun when loading vlenb The userspace load can put up to 2048 bits into an xlen bit stack buffer. We want only xlen bits, so check the size beforehand.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2025-39815 records a Unknown severity vulnerability in RISC-V: KVM: fix stack overrun when loading vlenb. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). 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). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=2fa290372dfe7dd248b1c16f943f273a3e674f22 <c76bf8359188a11f8fd790e5bbd6077894a245cc || >=2fa290372dfe7dd248b1c16f943f273a3e674f22 <6d28659b692a0212f360f8bd8a58712b339f9aac || >=2fa290372dfe7dd248b1c16f943f273a3e674f22 <799766208f09f95677a9ab111b93872d414fbad7 | c76bf8359188a11f8fd790e5bbd6077894a245cc, 6d28659b692a0212f360f8bd8a58712b339f9aac, 799766208f09f95677a9ab111b93872d414fbad7 |
| Linux/Linuxgeneric | 6.8 | Not reported |
Published upstream
Sep 16, 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: RISC-V: KVM: fix stack overrun when loading vlenb The userspace load can put up to 2048 bits into an xlen bit stack buffer. We want only xlen bits, so check the size beforehand.
Quoted source text, attributed separately from HOL analysis.