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Vulnerability DatabaseCVE-2025-38247
CVE-2025-38247:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2025-38247 is a vulnerability discovered in the Linux kernel, specifically related to a userns and mntidmap leak in opentree_attr(2) functionality. The vulnerability was disclosed on July 9, 2025 (NVD, Ubuntu).
Technical details
The vulnerability occurs when wantmountsetattr() returns a positive value, requiring finishmountkattr() to release ->mntuserns. However, failing domountsetattr() does not change this requirement, which can result in leaking userns and potentially mntidmap. The vulnerability has been assigned a CVSS v3.1 base score of 5.5, indicating moderate severity (Red Hat).
Impact
The primary impact of this vulnerability is a potential resource leak in the Linux kernel's mount namespace handling, which could lead to system resource exhaustion (NVD).
Mitigation and workarounds
Most major Linux distributions have addressed this vulnerability by marking their systems as 'Not affected' or by providing updates. Ubuntu has confirmed that all their supported releases are not affected by this vulnerability (Ubuntu).
Additional resources
Source: This report was generated using AI
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