# CVE-2025-38549: efivarfs: Fix memory leak of efivarfs\_fs\_info in fs\_context error paths

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-08-16 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 6.7

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
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  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-38549

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/816d36973467d1c9c08a48bdffe4675e219a2e84
- https://git.kernel.org/stable/c/e9fabe7036bb8be6071f39dc38605508f5f57b20
- https://git.kernel.org/stable/c/64e135f1eaba0bbb0cdee859af3328c68d5b9789

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