CVE-2026-74572

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A deadlock occurs in the btrfs zoned filesystem during metadata writeback and transaction commit. The btree writepages() function holds the fs info->zoned meta io lock throughout the writeback loop, including calls to btrfs check meta write pointer() and check bg is active(). For the tree-log block group, check bg is active() may call btrfs zone finish one bg() to free an active zone, which waits for the current transaction to commit while still holding the zoned meta io lock. Simultaneously, the transaction committer requires the same lock to write out tree extents, resulting in a deadlock between the metadata writeback task and the transaction commit task.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.