Riskcovery

CVE-2022-50766

btrfs: set generation before calling btrfs_clean_tree_block in btrfs_init_new_buffer

State
Published
Severity
Not scored
Published
Dec 24, 2025
Updated
May 11, 2026
Reserved
Dec 24, 2025

Read the record on cve.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().

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • bc877d285ca3dba24c52406946a4a69847cc7422 to before 0a408c6212c16b9a2a1141d3c531247582ef8101Affected
  • bc877d285ca3dba24c52406946a4a69847cc7422 to before a687c2890fe4a2acaac6941fa4097a1264d8f3ebAffected
  • bc877d285ca3dba24c52406946a4a69847cc7422 to before 89bc41c92d10b905c60f6ec13c9ef664a3555c54Affected
  • bc877d285ca3dba24c52406946a4a69847cc7422 to before cbddcc4fa3443fe8cfb2ff8e210deb1f6a0eea38Affected
LinuxLinux
  • 4.19Affected
  • before 4.19Not affected
  • 5.15.75 through 5.15.*Not affected
  • 5.19.17 through 5.19.*Not affected
  • 6.0.3 through 6.0.*Not affected
  • 6.1 and laterNot affected

References

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