CVE-2022-50766
Unknown Unknown - Not Provided
Uninitialized Value Vulnerability in Linux Kernel Btrfs Component

Publication date: 2025-12-24

Last updated on: 2025-12-24

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: set generation before calling btrfs_clean_tree_block in btrfs_init_new_buffer syzbot is reporting uninit-value in btrfs_clean_tree_block() [1], for commit bc877d285ca3dba2 ("btrfs: Deduplicate extent_buffer init code") missed that btrfs_set_header_generation() in btrfs_init_new_buffer() must not be moved to after clean_tree_block() because clean_tree_block() is calling btrfs_header_generation() since commit 55c69072d6bd5be1 ("Btrfs: Fix extent_buffer usage when nodesize != leafsize"). Since memzero_extent_buffer() will reset "struct btrfs_header" part, we can't move btrfs_set_header_generation() to before memzero_extent_buffer(). Just re-add btrfs_set_header_generation() before btrfs_clean_tree_block().
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Meta Information
Published
2025-12-24
Last Modified
2025-12-24
Generated
2026-06-16
AI Q&A
2025-12-24
EPSS Evaluated
2026-06-14
NVD
CVE-2022-50766
EUVD
EUVD-2022-55795
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability involves the Linux kernel's btrfs filesystem code, specifically in the function btrfs_init_new_buffer. A code change mistakenly moved the setting of the generation field in the btrfs header to after a function call (btrfs_clean_tree_block) that relies on that generation value. This caused an uninitialized value to be used, which is a bug. The fix was to ensure the generation is set before calling btrfs_clean_tree_block to avoid using uninitialized data.

Impact Analysis

The vulnerability can lead to the use of uninitialized memory values within the btrfs filesystem code, which may cause system instability, crashes, or data corruption when using btrfs. This could impact system reliability and data integrity on affected Linux systems.

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