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Vulnerability DatabaseCVE-2025-38202

CVE-2025-38202: 
Linux Kernel vulnerability analysis and mitigation

Overview

A vulnerability was discovered in the Linux kernel related to the bpfmaplookuppercpuelem() helper function (CVE-2025-38202). The issue was disclosed on July 4, 2025, affecting the Berkeley Packet Filter (BPF) subsystem (NVD).

Technical details

The vulnerability occurs when BPF JIT is disabled or under 32-bit host environments, where bpfmaplookuppercpuelem() will not be inlined. When used in a sleepable BPF program, it triggers a warning because the BPF program only holds rcureadlock_trace lock instead of the required lock check (NVD, Debian).

Impact

The vulnerability affects multiple Linux distributions and their derivatives, including Ubuntu and Debian. Various kernel versions are impacted across different releases, with some distributions already having fixes in place while others remain vulnerable (Ubuntu).

Mitigation and workarounds

The issue has been resolved in some Linux distributions. Debian has fixed the vulnerability in bullseye (5.10.237-1) and trixie (6.12.35-1) releases, while it remains vulnerable in bookworm. Ubuntu has marked this as a medium priority issue and is working on updates for affected versions (Debian).

Additional resources

Source: This report was generated using AI

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