Bug 2388922 (CVE-2025-38549)

Summary: CVE-2025-38549 kernel: efivarfs: Fix memory leak of efivarfs_fs_info in fs_context error paths
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-08-16 12:01:33 UTC 
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.
Comment 1 Alexander B 2025-08-18 11:42:11 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025081628-CVE-2025-38549-1e8e@gregkh/T