CVE-2026-74319
Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: zoned: fix deadlock waiting for ticket during data relocation When performing data relocation on a zoned filesystem, BTRFS can deadlock in handle_reserve_tickets(). The relocation process is waiting on a space reservation ticket that can never be fulfilled, because the relocation itself is the operation responsible for freeing up that space. Fix this by introducing a new flush state, BTRFS_RESERVE_FLUSH_ZONED_RELOCATION, specifically for data chunk allocation during zoned relocation. Like BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE, this state uses priority_reclaim_data_space() instead of the normal flushing path, which avoids re-entering the relocation code and breaking the deadlock cycle. In btrfs_alloc_data_chunk_ondemand(), select this new flush state when the inode belongs to a data relocation root on a zoned filesystem.
How to fix
- Linux Linuxf84dbbaa988e1344634a20ddf6c7d51a99f12477, 814c3b4ea357297c507158bceb07bcdc5fbe9808 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | e2a7fd22378f6500bcf979edc71e6837271eacfd ≤ v < f84dbbaa988e1344634a20ddf6c7d51a99f12477, e2a7fd22378f6500bcf979edc71e6837271eacfd ≤ v < 814c3b4ea357297c507158bceb07bcdc5fbe9808, 7.1 | f84dbbaa988e1344634a20ddf6c7d51a99f12477, 814c3b4ea357297c507158bceb07bcdc5fbe9808 |
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