{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-40196",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-40196"
  ],
  "published": "2025-11-12T22:01:07Z",
  "summary": "fs: quota: create dedicated workqueue for quota_release_work",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: quota: create dedicated workqueue for quota_release_work\n\nThere is a kernel panic due to WARN_ONCE when panic_on_warn is set.\n\nThis issue occurs when writeback is triggered due to sync call for an\nopened file(ie, writeback reason is WB_REASON_SYNC). When f2fs balance\nis needed at sync path, flush for quota_release_work is triggered.\nBy default quota_release_work is queued to \"events_unbound\" queue which\ndoes not have WQ_MEM_RECLAIM flag. During f2fs balance \"writeback\"\nworkqueue tries to flush quota_release_work causing kernel panic due to\nMEM_RECLAIM flag mismatch errors.\n\nThis patch creates dedicated workqueue with WQ_MEM_RECLAIM flag\nfor work quota_release_work.\n\n------------[ cut here ]------------\nWARNING: CPU: 4 PID: 14867 at kernel/workqueue.c:3721 check_flush_dependency+0x13c/0x148\nCall trace:\n check_flush_dependency+0x13c/0x148\n __flush_work+0xd0/0x398\n flush_delayed_work+0x44/0x5c\n dquot_writeback_dquots+0x54/0x318\n f2fs_do_quota_sync+0xb8/0x1a8\n f2fs_write_checkpoint+0x3cc/0x99c\n f2fs_gc+0x190/0x750\n f2fs_balance_fs+0x110/0x168\n f2fs_write_single_data_page+0x474/0x7dc\n f2fs_write_data_pages+0x7d0/0xd0c\n do_writepages+0xe0/0x2f4\n __writeback_single_inode+0x44/0x4ac\n writeback_sb_inodes+0x30c/0x538\n wb_writeback+0xf4/0x440\n wb_workfn+0x128/0x5d4\n process_scheduled_works+0x1c4/0x45c\n worker_thread+0x32c/0x3e8\n kthread+0x11c/0x1b0\n ret_from_fork+0x10/0x20\nKernel panic - not syncing: kernel: panic_on_warn set ...",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-40196"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8df2eedd371a1c24ecc4283581299d7737dfcd06"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f846eacde280ecc3daedfe001580e3033565179e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f12039df1515d5daf7d92e586ece5cefeb39561b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8a09a62f0c8c6123c2f1864ed6d5f9eb144afaf0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/72b7ceca857f38a8ca7c5629feffc63769638974"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-07-24T14:40:09Z"
  }
}