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Vulnerability DatabaseCVE-2025-40059

CVE-2025-40059: 
Linux Debian vulnerability analysis and mitigation

Overview

CVE-2025-40059 is a vulnerability discovered in the Linux kernel's coresight subsystem, specifically related to incorrect handling of return values from devm_kzalloc function. The vulnerability was disclosed on October 28, 2025, affecting various Linux kernel versions (NVD, Debian).

Technical details

The vulnerability stems from improper handling of the return value of devm_kzalloc function in the coresight subsystem. Specifically, the function could return a null pointer, and the code needed to be modified to use '!desc.pdata' to properly handle such cases (Debian).

Impact

The vulnerability affects multiple Linux distributions and versions, with varying levels of impact. Several Ubuntu releases including 25.10 (questing), 25.04 (plucky), and 24.04 LTS (noble) are marked as vulnerable, while older versions like 22.04 LTS (jammy) and 20.04 LTS (focal) are not affected (Ubuntu).

Mitigation and workarounds

Fixed versions have been released for various distributions. Debian has addressed the issue in version 6.17.6-1 for unstable and 6.12.57-1 for trixie. The vulnerability is not present in some older releases like bookworm and bullseye (Debian).

Additional resources

Source: This report was generated using AI

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