CVE-2025-39815
Unknown
Unknown - Not Provided
BaseFortify
Publication date: 2025-09-16
Last updated on: 2025-12-02
Assigner: kernel.org
Description
Description
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.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| linux | linux_kernel | From 6.8 (inc) to 6.12.45 (exc) |
| linux | linux_kernel | From 6.13 (inc) to 6.16.5 (exc) |
| linux | linux_kernel | 6.17 |
| linux | linux_kernel | 6.17 |
| linux | linux_kernel | 6.17 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-NVD-CWE-noinfo |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a stack overrun issue in the Linux kernel's RISC-V KVM implementation. Specifically, when loading the 'vlenb' value, the userspace can load up to 2048 bits into a stack buffer that is only designed to hold 'xlen' bits. The fix involves checking the size beforehand to prevent this overrun.
How can this vulnerability impact me? :
The stack overrun could potentially lead to memory corruption, which might be exploited to cause crashes, data corruption, or arbitrary code execution within the kernel environment, impacting system stability and security.
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