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Back to active CVEs
Unknown severity · Source severity not reportedCVE-2026-90265

btrfs: defrag: fix deadlock between defrag and delalloc space reservationCVE-2026-90265

Answer in brief

CVE-2026-90265 records a Unknown severity vulnerability in btrfs: defrag: fix deadlock between defrag and delalloc space reservation. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Oct 30, 2026Source checked Nov 1, 2026First seen by HOL Sep 17, 2026Material review Oct 30, 2026
Upstream Advisory

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Nov 1, 2026
References
6 linked sources
Open source record

Key facts

Risk
Unknown severitySource severity not reported
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=22b398eeeed43d51e85b1008e51bf9663ac1f491 <a9701dd06e82c345fe70debdf8835b7eb5000c59 || >=22b398eeeed43d51e85b1008e51bf9663ac1f491 <ac916391e1c70801649f7d6f85014f687983bc33 || >=22b398eeeed43d51e85b1008e51bf9663ac1f491 <ba02eab28041f9a4bbe9fc90c7249644fef6de0fa9701dd06e82c345fe70debdf8835b7eb5000c59, ac916391e1c70801649f7d6f85014f687983bc33, ba02eab28041f9a4bbe9fc90c7249644fef6de0f
Linux/Linuxgeneric5.16Not reported
Linux/Linuxgeneric>=22b398eeeed43d51e85b1008e51bf9663ac1f491 <c97277aa6ce8ac725642aced0fe20cd8d31f6e09 || >=22b398eeeed43d51e85b1008e51bf9663ac1f491 <37614074596827a5f292243673b699c90ff63e7d || >=22b398eeeed43d51e85b1008e51bf9663ac1f491 <a9701dd06e82c345fe70debdf8835b7eb5000c59 || >=22b398eeeed43d51e85b1008e51bf9663ac1f491 <ac916391e1c70801649f7d6f85014f687983bc33 || >=22b398eeeed43d51e85b1008e51bf9663ac1f491 <ba02eab28041f9a4bbe9fc90c7249644fef6de0fc97277aa6ce8ac725642aced0fe20cd8d31f6e09, 37614074596827a5f292243673b699c90ff63e7d, a9701dd06e82c345fe70debdf8835b7eb5000c59, ac916391e1c70801649f7d6f85014f687983bc33, ba02eab28041f9a4bbe9fc90c7249644fef6de0f
Linux/Linuxgeneric>=22b398eeeed43d51e85b1008e51bf9663ac1f491 <046396bd16fdf0a9fbdf5f04c6eda26024e7695e || >=22b398eeeed43d51e85b1008e51bf9663ac1f491 <c97277aa6ce8ac725642aced0fe20cd8d31f6e09 || >=22b398eeeed43d51e85b1008e51bf9663ac1f491 <37614074596827a5f292243673b699c90ff63e7d || >=22b398eeeed43d51e85b1008e51bf9663ac1f491 <a9701dd06e82c345fe70debdf8835b7eb5000c59 || >=22b398eeeed43d51e85b1008e51bf9663ac1f491 <ac916391e1c70801649f7d6f85014f687983bc33 || >=22b398eeeed43d51e85b1008e51bf9663ac1f491 <ba02eab28041f9a4bbe9fc90c7249644fef6de0f046396bd16fdf0a9fbdf5f04c6eda26024e7695e, c97277aa6ce8ac725642aced0fe20cd8d31f6e09, 37614074596827a5f292243673b699c90ff63e7d, a9701dd06e82c345fe70debdf8835b7eb5000c59, ac916391e1c70801649f7d6f85014f687983bc33, ba02eab28041f9a4bbe9fc90c7249644fef6de0f

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to a9701dd06e82c345fe70debdf8835b7eb5000c59; Linux/Linux to c97277aa6ce8ac725642aced0fe20cd8d31f6e09; Linux/Linux to 046396bd16fdf0a9fbdf5f04c6eda26024e7695e if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 17, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 30, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 17, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: btrfs: defrag: fix deadlock between defrag and delalloc space reservation While running fsstress with autodefrag and flushoncommit, hit a deadlock due to the fact that defrag reserves delalloc space while it's holding dirty and locked folios, besides the extent range lock. The stack traces are the following: [958.624] task:kworker/u50:3 state:D stack:0 pid:20365 tgid:20365 ppid:2 task_flags:0x4208060 flags:0x00080000 [958.626] Workqueue: events_unbound btrfs_async_reclaim_metadata_space [btrfs] [958.627] Call Trace: [958.628] <TASK> [958.628] __schedule+0x4be/0x10f0 [958.629] ? preempt_count_add+0x69/0xa0 [958.630] schedule+0x26/0xd0 [958.631] wait_current_trans+0x102/0x160 [btrfs] [958.632] ? __pfx_autoremove_wake_function+0x10/0x10 [958.633] start_transaction+0x374/0x900 [btrfs] [958.634] btrfs_commit_current_transaction+0x1d/0x70 [btrfs] [958.635] flush_space+0xca/0x5e0 [btrfs] [958.636] ? _raw_spin_unlock+0x15/0x30 [958.637] ? btrfs_reduce_alloc_profile+0x8c/0x190 [btrfs] [958.639] ? _raw_spin_unlock+0x15/0x30 [958.640] ? calc_available_free_space.isra.0+0x6f/0x110 [btrfs] [958.641] do_async_reclaim_metadata_space+0x84/0x190 [btrfs] [958.642] btrfs_async_reclaim_metadata_space+0x64/0x80 [btrfs] [958.644] process_one_work+0x19d/0x3a0 [958.644] worker_thread+0x1c4/0x330 [958.645] ? __pfx_worker_thread+0x10/0x10 [958.646] kthread+0xfc/0x130 [958.647] ? __pfx_kthread+0x10/0x10 [958.648] ret_from_fork+0x1f7/0x2c0 [958.648] ? __pfx_kthread+0x10/0x10 [958.649] ret_from_fork_asm+0x1a/0x30 [958.650] </TASK> [958.651] task:kworker/u49:7 state:D stack:0 pid:52990 tgid:52990 ppid:2 task_flags:0x4208060 flags:0x00080000 [958.653] Workqueue: writeback wb_workfn (flush-btrfs-334) [958.655] Call Trace: [958.655] <TASK> [958.656] __schedule+0x4be/0x10f0 [958.657] ? __blk_flush_plug+0xe9/0x140 [958.658] schedule+0x26/0xd0 [958.658] io_schedule+0x42/0x70 [958.659] folio_wait_bit_common+0x12b/0x330 [958.660] ? folio_wait_bit_common+0x100/0x330 [958.662] ? __pfx_wake_page_function+0x10/0x10 [958.663] extent_write_cache_pages+0x599/0x830 [btrfs] [958.664] ? acpi_fwnode_get_reference_args+0x1fa/0x270 [958.665] btrfs_writepages+0x77/0x130 [btrfs] [958.666] ? __pfx_end_bbio_data_write+0x10/0x10 [btrfs] [958.667] do_writepages+0xc6/0x160 [958.668] __writeback_single_inode+0x42/0x310 [958.669] writeback_sb_inodes+0x231/0x570 [958.670] wb_writeback+0x8a/0x340 [958.671] wb_workfn+0xbf/0x450 [958.672] ? finish_task_switch.isra.0+0xc1/0x350 [958.673] process_one_work+0x19d/0x3a0 [958.673] worker_thread+0x1c4/0x330 [958.674] ? __pfx_worker_thread+0x10/0x10 [958.675] kthread+0xfc/0x130 [958.676] ? __pfx_kthread+0x10/0x10 [958.676] ret_from_fork+0x1f7/0x2c0 [958.677] ? __pfx_kthread+0x10/0x10 [958.678] ret_from_fork_asm+0x1a/0x30 [958.679] </TASK> [958.679] task:btrfs-cleaner state:D stack:0 pid:296750 tgid:296750 ppid:2 task_flags:0x208040 flags:0x00080000 [958.681] Call Trace: [958.682] <TASK> [958.682] __schedule+0x4be/0x10f0 [958.683] schedule+0x26/0xd0 [958.684] handle_reserve_ticket+0x1b9/0x2c0 [btrfs] [958.685] ? __pfx_autoremove_wake_function+0x10/0x10 [958.686] reserve_bytes+0x283/0x4c0 [btrfs] [958.687] btrfs_reserve_metadata_bytes+0x18/0xb0 [btrfs] [958.688] btrfs_delalloc_reserve_metadata+0x121/0x320 [btrfs] [958.690] btrfs_delalloc_reserve_space+0x46/0xb0 [btrfs] [958.691] btrfs_defrag_file+0x903/0x1110 [btrfs] [958.692] btrfs_run_defrag_inodes+0x334/0x430 [btrfs] [958.694] cleaner_kthread+0x97/0x1c0 [btrfs] [958.694] ? __pfx_cleaner_kthread+0x10/0x10 [btrfs] [958.696] kthread+0xfc/0x130 [958.696] ? __pfx_kthread+0x10/0x10 [958.697] ret_ ---truncated---

Quoted source text, attributed separately from HOL analysis.