{
  "cveId": "CVE-2026-74572",
  "url": "https://patchblox.com/security/cve/CVE-2026-74572",
  "summary": "CVE-2026-74572 is fixed in 74 products on 1 platform, first by DEBIAN-CVE-2026-74572, released August 16, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "btrfs: zoned: fix deadlock between metadata writeback and transaction commit",
  "description": "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-\u003Ezoned_meta_io_lock across the whole writeback loop, including the call to btrfs_check_meta_write_pointer() -\u003E 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()               \u003Cblocks on zoned_meta_io_lock,        btrfs_zone_finish()                      held by Task A\u003E         do_zone_finish()          btrfs_inc_block_group_ro()           btrfs_wait_for_commit()            \u003Cblocks waiting for commit             of transaction T, done by             Task B\u003E  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-\u003Eactive_{meta,system}_bg, which this branch does not touch, and ctx-\u003Ezoned_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.",
  "published": "2026-08-15T13:18:02Z",
  "severity": "Moderate",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00346,
  "epssPercentile": 0.28356,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74572",
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  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}