CVE-2025-39815
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-16

Last updated on: 2025-12-02

Assigner: kernel.org

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.
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Meta Information
Published
2025-09-16
Last Modified
2025-12-02
Generated
2026-06-16
AI Q&A
2025-09-16
EPSS Evaluated
2026-06-15
NVD
CVE-2025-39815
Affected Vendors & Products
Showing 5 associated CPEs
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
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Exploitability
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CWE ID Description
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Executive Summary

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.

Impact Analysis

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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