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().
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-develUpgrade kernel-debuginfoUpgrade kernel-develUpgrade perfUpgrade perf-debuginfoUpgrade kernel-headersUpgrade bpftoolUpgrade python-perf-debuginfoUpgrade kernel-toolsUpgrade bpftool-debuginfoUpgrade kernel-livepatch-5.15.75-48.135Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-debuginfoUpgrade kernelUpgrade python-perf | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Dec 29, 2025 | Dec 29, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Dec 24, 2025 |
| Ubuntu | — | Upgrade linux-lowlatencyUpgrade linux-nvidiaUpgrade linux-ibmUpgrade linux-azure-5.15Upgrade linux-gcpUpgrade linux-azureUpgrade linux-kvmUpgrade linux-intel-iotg-5.15Upgrade linux-realtimeUpgrade linux-riscv-5.15Upgrade linux-gkeopUpgrade linux-oracle-5.15Upgrade linux-azure-fdeUpgrade linux-hwe-5.15Upgrade linux-intel-iotgUpgrade linux-gcp-5.15Upgrade linux-oracleUpgrade linuxUpgrade linux-bluefieldUpgrade linux-raspiUpgrade linux-awsUpgrade linux-aws-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-gke | Jan 6, 2026 | Dec 24, 2025 |
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