{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "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]  \u003cTASK\u003e    [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]  \u003c/TASK\u003e    [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]  \u003cTASK\u003e    [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]  \u003c/TASK\u003e    [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]  \u003cTASK\u003e    [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---",
  "id": "DEBIAN-CVE-2026-90265",
  "modified": "2026-09-18T04:47:27.444486497Z",
  "published": "2026-09-17T17:17:23.017Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-90265"
    }
  ],
  "upstream": [
    "CVE-2026-90265"
  ]
}