Rebuilding Free Space Tree Vulnerability in Linux Kernel by Linux Foundation

CVE-2025-38370

What is CVE-2025-38370?

A vulnerability in the Linux Kernel concerning the btrfs filesystem has been identified, specifically in the reconstruction process of the free space tree. Under certain conditions, when concurrently modifying this tree, new block groups may be inadvertently created. This can lead to an error during the rebuild process, manifesting as a transaction abortion due to an existing entry in the free space. This issue underscores the need for careful transaction management during complex filesystem operations to maintain system stability.

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