CVE-2025-39815

MEDIUM

Linux Kernel - Stack Overflow in RISC-V KVM vlenb Loading

Title source: llm

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.

References (3)

Core 3

Core References

Patch

https://git.kernel.org/stable/c/c76bf8359188a11f8fd790e5bbd6077894a245cc

Patch

https://git.kernel.org/stable/c/6d28659b692a0212f360f8bd8a58712b339f9aac

Patch

https://git.kernel.org/stable/c/799766208f09f95677a9ab111b93872d414fbad7

Scores

CVSS v3 5.5

EPSS 0.0014

EPSS Percentile 3.3%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

Status published

Products (12)

linux/Kernel 6.13.0 - 6.16.5linux

linux/Kernel 6.8.0 - 6.12.45linux

Linux/Linux < 6.8

Linux/Linux 2fa290372dfe7dd248b1c16f943f273a3e674f22 - 6d28659b692a0212f360f8bd8a58712b339f9aac

Linux/Linux 2fa290372dfe7dd248b1c16f943f273a3e674f22 - 799766208f09f95677a9ab111b93872d414fbad7

Linux/Linux 2fa290372dfe7dd248b1c16f943f273a3e674f22 - c76bf8359188a11f8fd790e5bbd6077894a245cc

Linux/Linux 6.12.45 - 6.12.*

Linux/Linux 6.16.5 - 6.16.*

Linux/Linux 6.17

Linux/Linux 6.8

... and 2 more

Published Sep 16, 2025

Tracked Since Feb 18, 2026