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Vulnerability DatabaseCVE-2025-40193
CVE-2025-40193:
CBL Mariner vulnerability analysis and mitigation
Overview
CVE-2025-40193 is a vulnerability discovered in the Linux kernel, specifically affecting the xtensa simdisk component. The vulnerability was disclosed on November 12, 2025, and involves insufficient input validation in the proc_write_simdisk function (Ubuntu Security, AttackerKB).
Technical details
The vulnerability stems from improper input size checking in the proc_write_simdisk function, where a malicious user could pass an arbitrarily bad value to memdup_user_nul(). This follows a similar pattern to a previous issue addressed by commit ee76746387f6 regarding netdevsim's input validation (Debian Security).
Impact
If exploited, this vulnerability could potentially cause a kernel crash, affecting system stability and availability (Ubuntu Security).
Mitigation and workarounds
Fixed versions have been released for various Linux distributions. Debian has addressed this in version 6.1.158-1 for bookworm and 6.12.57-1 for trixie. Ubuntu has released patches for multiple affected versions across different kernel variants (Debian Security, Ubuntu Security).
Additional resources
Source: This report was generated using AI
Related CBL Mariner vulnerabilities:
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