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CVE-2025-38549

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: efivarfs: Fix memory leak of efivarfs_fs_info in fs_context error paths When processing mount options, efivarfs allocates efiva…

Published Aug 16, 2025CWE-401EPSS 0.15%

Overview

CVE-2025-38549 is a medium-severity vulnerability. It was published on August 16, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

efivarfs: Fix memory leak of efivarfs_fs_info in fs_context error paths

When processing mount options, efivarfs allocates efivarfs_fs_info (sfi)

early in fs_context initialization. However, sfi is associated with the

superblock and typically freed when the superblock is destroyed. If the

fs_context is released (final put) before fill_super is called—such as

on error paths or during reconfiguration—the sfi structure would leak,

as ownership never transfers to the superblock.

Implement the .free callback in efivarfs_context_ops to ensure any

allocated sfi is properly freed if the fs_context is torn down before

fill_super, preventing this memory leak.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/64e135f1eaba0bbb0cdee859af3328c68d5b9789Refgit.kernel.org/stable/c/816d36973467d1c9c08a48bdffe4675e219a2e84Refgit.kernel.org/stable/c/e9fabe7036bb8be6071f39dc38605508f5f57b20

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38549?

CVE-2025-38549 is a medium-severity vulnerability. It was published on August 16, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-38549?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-38549?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-38549?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38549 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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