CVE-2026-74572High· 7.5▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: btrfs: zoned: fix deadlock between metadata writeback and transaction commit When writing out metadata extent buffers in a zoned filesystem, btree_writepages() holds f…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.3%
In the Linux kernel, the following vulnerability has been resolved:
btrfs: zoned: fix deadlock between metadata writeback and transaction commit
When writing out metadata extent buffers in a zoned filesystem, btree_writepages() holds fs_info->zoned_meta_io_lock across the whole writeback loop, including the call to btrfs_check_meta_write_pointer() -> check_bg_is_active().
For the tree-log block group, check_bg_is_active() may fail to activate the zone and fall back to btrfs_zone_finish_one_bg() to free an active zone. That path waits for the running transaction to commit while still holding zoned_meta_io_lock, but the committer needs that same lock to write out the tree extents, so the two tasks deadlock:
Task A (kworker, metadata writeback) Task B (fsstress, transaction commit)
wb_workfn() btrfs_commit_transaction(T) btree_writepages() btrfs_write_and_wait_transaction() btrfs_zoned_meta_io_lock() btrfs_write_marked_extents() btrfs_check_meta_write_pointer() btree_writepages() check_bg_is_active() [treelog_bg] btrfs_zoned_meta_io_lock() btrfs_zone_finish_one_bg() <blocks on zoned_meta_io_lock, btrfs_zone_finish() held by Task A> do_zone_finish() btrfs_inc_block_group_ro() btrfs_wait_for_commit() <blocks waiting for commit of transaction T, done by Task B>
The sibling branch in check_bg_is_active() already drops zoned_meta_io_lock around do_zone_finish() for this exact reason. Do the same in the tree-log branch: release the lock around btrfs_zone_finish_one_bg() and re-acquire it afterwards. The lock only protects fs_info->active_{meta,system}_bg, which this branch does not touch, and ctx->zoned_bg keeps a reference to the block group across the unlock, so nothing is lost while the lock is dropped.
This hang occasionally reproduces with fstests generic/475 on a zoned btrfs filesystem.
Linux >= 13bb483d32abb6f8ebd40141d87eb68f11cc2dd2 < 18577e77c2c8adaadf1f7c6e9bcd1c0b14e5dcddLinux >= 13bb483d32abb6f8ebd40141d87eb68f11cc2dd2 < c3320873e0c04ce7b746fc8fe948f07bbbbdec33Linux >= 13bb483d32abb6f8ebd40141d87eb68f11cc2dd2 < deddd28fd83c264ee2ff5cd6b34449a9f1be6112Linux >= 13bb483d32abb6f8ebd40141d87eb68f11cc2dd2 < 75859a7cd77cd2ddaddbcb963e3fcd34738953afLinux >= 13bb483d32abb6f8ebd40141d87eb68f11cc2dd2 < 1ebe51c29fa9755d5b2fea28727c051117907cf8Linux fca3a1cd3ba47f1815e0c0fcdc9aafaf02ee0a75Linux >= 6.5.5 < 6.6Linux 6.6Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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