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Vulnerability DatabaseCVE-2025-39800

CVE-2025-39800: 
Linux Kernel vulnerability analysis and mitigation

Overview

CVE-2025-39800 is a vulnerability discovered in the Linux kernel's btrfs filesystem component, specifically in the btrfs_copy_root() function. The vulnerability was disclosed on September 15, 2025, affecting multiple Linux distributions and their kernel versions (NVD, Ubuntu).

Technical details

The vulnerability occurs in the btrfs filesystem when handling extent buffer generation during root copying operations. Specifically, when an unexpected generation for the extent buffer is encountered during btrfs_copy_root() execution, the system only triggers a WARN_ON() without properly aborting the transaction, allowing metadata with unexpected generation to persist (NVD).

Impact

The vulnerability allows metadata with unexpected generation values to persist in the btrfs filesystem, potentially leading to filesystem inconsistencies and data integrity issues (NVD).

Mitigation and workarounds

The fix involves modifying the btrfs_copy_root() function to abort the transaction and return -EUCLEAN when an unexpected generation is encountered, rather than just issuing a warning. This has been implemented in various Linux distribution updates (NVD, Debian).

Additional resources

Source: This report was generated using AI

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