{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-68756",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-68756"
  ],
  "published": "2026-01-05T09:32:59Z",
  "summary": "block: Use RCU in blk_mq_[un]quiesce_tagset() instead of set->tag_list_lock",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: Use RCU in blk_mq_[un]quiesce_tagset() instead of set->tag_list_lock\n\nblk_mq_{add,del}_queue_tag_set() functions add and remove queues from\ntagset, the functions make sure that tagset and queues are marked as\nshared when two or more queues are attached to the same tagset.\nInitially a tagset starts as unshared and when the number of added\nqueues reaches two, blk_mq_add_queue_tag_set() marks it as shared along\nwith all the queues attached to it. When the number of attached queues\ndrops to 1 blk_mq_del_queue_tag_set() need to mark both the tagset and\nthe remaining queues as unshared.\n\nBoth functions need to freeze current queues in tagset before setting on\nunsetting BLK_MQ_F_TAG_QUEUE_SHARED flag. While doing so, both functions\nhold set->tag_list_lock mutex, which makes sense as we do not want\nqueues to be added or deleted in the process. This used to work fine\nuntil commit 98d81f0df70c (\"nvme: use blk_mq_[un]quiesce_tagset\")\nmade the nvme driver quiesce tagset instead of quiscing individual\nqueues. blk_mq_quiesce_tagset() does the job and quiesce the queues in\nset->tag_list while holding set->tag_list_lock also.\n\nThis results in deadlock between two threads with these stacktraces:\n\n  __schedule+0x47c/0xbb0\n  ? timerqueue_add+0x66/0xb0\n  schedule+0x1c/0xa0\n  schedule_preempt_disabled+0xa/0x10\n  __mutex_lock.constprop.0+0x271/0x600\n  blk_mq_quiesce_tagset+0x25/0xc0\n  nvme_dev_disable+0x9c/0x250\n  nvme_timeout+0x1fc/0x520\n  blk_mq_handle_expired+0x5c/0x90\n  bt_iter+0x7e/0x90\n  blk_mq_queue_tag_busy_iter+0x27e/0x550\n  ? __blk_mq_complete_request_remote+0x10/0x10\n  ? __blk_mq_complete_request_remote+0x10/0x10\n  ? __call_rcu_common.constprop.0+0x1c0/0x210\n  blk_mq_timeout_work+0x12d/0x170\n  process_one_work+0x12e/0x2d0\n  worker_thread+0x288/0x3a0\n  ? rescuer_thread+0x480/0x480\n  kthread+0xb8/0xe0\n  ? kthread_park+0x80/0x80\n  ret_from_fork+0x2d/0x50\n  ? kthread_park+0x80/0x80\n  ret_from_fork_asm+0x11/0x20\n\n  __schedule+0x47c/0xbb0\n  ? xas_find+0x161/0x1a0\n  schedule+0x1c/0xa0\n  blk_mq_freeze_queue_wait+0x3d/0x70\n  ? destroy_sched_domains_rcu+0x30/0x30\n  blk_mq_update_tag_set_shared+0x44/0x80\n  blk_mq_exit_queue+0x141/0x150\n  del_gendisk+0x25a/0x2d0\n  nvme_ns_remove+0xc9/0x170\n  nvme_remove_namespaces+0xc7/0x100\n  nvme_remove+0x62/0x150\n  pci_device_remove+0x23/0x60\n  device_release_driver_internal+0x159/0x200\n  unbind_store+0x99/0xa0\n  kernfs_fop_write_iter+0x112/0x1e0\n  vfs_write+0x2b1/0x3d0\n  ksys_write+0x4e/0xb0\n  do_syscall_64+0x5b/0x160\n  entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\nThe top stacktrace is showing nvme_timeout() called to handle nvme\ncommand timeout. timeout handler is trying to disable the controller and\nas a first step, it needs to blk_mq_quiesce_tagset() to tell blk-mq not\nto call queue callback handlers. The thread is stuck waiting for\nset->tag_list_lock as it tries to walk the queues in set->tag_list.\n\nThe lock is held by the second thread in the bottom stack which is\nwaiting for one of queues to be frozen. The queue usage counter will\ndrop to zero after nvme_timeout() finishes, and this will not happen\nbecause the thread will wait for this mutex forever.\n\nGiven that [un]quiescing queue is an operation that does not need to\nsleep, update blk_mq_[un]quiesce_tagset() to use RCU instead of taking\nset->tag_list_lock, update blk_mq_{add,del}_queue_tag_set() to use RCU\nsafe list operations. Also, delete INIT_LIST_HEAD(&q->tag_set_list)\nin blk_mq_del_queue_tag_set() because we can not re-initialize it while\nthe list is being traversed under RCU. The deleted queue will not be\nadded/deleted to/from a tagset and it will be freed in blk_free_queue()\nafter the end of RCU grace period.",
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