BaseFortify

Publication date: 2025-11-12

Last updated on: 2025-11-14

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: xtensa: simdisk: add input size check in proc_write_simdisk A malicious user could pass an arbitrarily bad value to memdup_user_nul(), potentially causing kernel crash. This follows the same pattern as commit ee76746387f6 ("netdevsim: prevent bad user input in nsim_dev_health_break_write()")

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-11-12

Last Modified

2025-11-14

Generated

2026-07-06

AI Q&A

2025-11-13

EPSS Evaluated

2026-07-05

NVD

CVE-2025-40193

Affected Vendors & Products

Vendor	Product	Version / Range
linux	kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability in the Linux kernel's xtensa simdisk component involves a missing input size check in the proc_write_simdisk function. A malicious user could provide an invalid value to the memdup_user_nul() function, which may lead to a kernel crash.

Impact Analysis

The vulnerability can cause the Linux kernel to crash if exploited, potentially leading to denial of service or system instability.

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