CVE-2022-50766

A use of uninitialized memory was found in the Linux kernel's btrfs filesystem. In btrfs_init_new_buffer(), btrfs_set_header_generation() was moved after btrfs_clean_tree_block() during code refactoring. However, btrfs_clean_tree_block() calls btrfs_header_generation() which reads the generation value before it is initialized, causing use of uninitialized data.

This flaw was discovered by syzbot and affects btrfs filesystems during extent buffer initialization. The uninitialized value read occurs in the b-tree block cleaning path. While this primarily causes undefined behavior from reading uninitialized memory, it could potentially lead to incorrect decisions based on garbage values.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.