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btrfs: zoned: fix deadlock between metadata writeback and transaction commit

Type: advisorySource: Official CVE List1 source record

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() do_zone_finish() btrfs_inc_block_group_ro() btrfs_wait_for_commit() 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->activ

Announced Source revision 1
Original source ↗

CVE-2026-74572

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-74572

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "13bb483d32abb6f8ebd40141d87eb68f11cc2dd2",
        "lessThan": "18577e77c2c8adaadf1f7c6e9bcd1c0b14e5dcdd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "13bb483d32abb6f8ebd40141d87eb68f11cc2dd2",
        "lessThan": "c3320873e0c04ce7b746fc8fe948f07bbbbdec33",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "13bb483d32abb6f8ebd40141d87eb68f11cc2dd2",
        "lessThan": "deddd28fd83c264ee2ff5cd6b34449a9f1be6112",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "13bb483d32abb6f8ebd40141d87eb68f11cc2dd2",
        "lessThan": "75859a7cd77cd2ddaddbcb963e3fcd34738953af",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "13bb483d32abb6f8ebd40141d87eb68f11cc2dd2",
        "lessThan": "1ebe51c29fa9755d5b2fea28727c051117907cf8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fca3a1cd3ba47f1815e0c0fcdc9aafaf02ee0a75",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6.5.5",
        "lessThan": "6.6",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "fs/btrfs/zoned.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.6"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.6",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.151",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.103",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.44",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.8",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/btrfs/zoned.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74572

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#33211 · Revision 1
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Publisher date
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