Cloud Vulnerability DB
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Vulnerability DatabaseCVE-2025-38037
CVE-2025-38037:
Linux Kernel vulnerability analysis and mitigation
Overview
A data race vulnerability was identified in the Linux kernel's VXLAN implementation (CVE-2025-38037), discovered on June 18, 2025. The vulnerability affects the 'used' and 'updated' fields in the FDB (Forwarding Database) entry structure, which can be accessed concurrently by multiple threads (NVD CVE, Debian Tracker).
Technical details
The vulnerability exists in the VXLAN implementation where concurrent access to FDB entry structure fields occurs without proper synchronization. The issue manifests when multiple threads simultaneously access the 'used' and 'updated' fields, leading to potential data races. The vulnerability was detected by the Kernel Concurrency Sanitizer (KCSAN) and can be reproduced using specific test cases involving concurrent VXLAN packet transmission (NVD CVE).
Impact
The data race condition affects Linux kernel versions up to 6.13.0-rc7, potentially impacting systems using VXLAN networking features. Affected Debian releases include bullseye, bookworm, and trixie versions prior to the fix (Debian Tracker).
Mitigation and workarounds
The vulnerability has been fixed in Linux kernel version 6.12.32-1 and later by implementing proper synchronization using READONCE() and WRITEONCE() operations for accessing the affected FDB entry fields. Users are advised to upgrade to the fixed version (Debian Tracker).
Additional resources
Source: This report was generated using AI
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