CVE-2025-39800
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-15

Last updated on: 2025-11-03

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: abort transaction on unexpected eb generation at btrfs_copy_root() If we find an unexpected generation for the extent buffer we are cloning at btrfs_copy_root(), we just WARN_ON() and don't error out and abort the transaction, meaning we allow to persist metadata with an unexpected generation. Instead of warning only, abort the transaction and return -EUCLEAN.
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Meta Information
Published
2025-09-15
Last Modified
2025-11-03
Generated
2026-06-16
AI Q&A
2025-09-15
EPSS Evaluated
2026-06-15
NVD
CVE-2025-39800
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel 6.1.153
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability in the Linux kernel's btrfs filesystem occurs because when an unexpected generation number is found for the extent buffer during the btrfs_copy_root() operation, the system only issues a warning (WARN_ON()) instead of aborting the transaction. This behavior allows metadata with an unexpected generation to be persisted, which is incorrect. The fix changes this so that the transaction is aborted and an error (-EUCLEAN) is returned when such an unexpected generation is detected.

Impact Analysis

The vulnerability can lead to the persistence of incorrect or corrupted metadata in the btrfs filesystem because transactions are not properly aborted when unexpected extent buffer generations are encountered. This could potentially cause filesystem inconsistencies or data integrity issues.

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