{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43314",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-43314"
  ],
  "published": "2026-05-08T13:13:56Z",
  "summary": "dm: remove fake timeout to avoid leak request",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm: remove fake timeout to avoid leak request\n\nSince commit 15f73f5b3e59 (\"blk-mq: move failure injection out of\nblk_mq_complete_request\"), drivers are responsible for calling\nblk_should_fake_timeout() at appropriate code paths and opportunities.\n\nHowever, the dm driver does not implement its own timeout handler and\nrelies on the timeout handling of its slave devices.\n\nIf an io-timeout-fail error is injected to a dm device, the request\nwill be leaked and never completed, causing tasks to hang indefinitely.\n\nReproduce:\n1. prepare dm which has iscsi slave device\n2. inject io-timeout-fail to dm\n   echo 1 >/sys/class/block/dm-0/io-timeout-fail\n   echo 100 >/sys/kernel/debug/fail_io_timeout/probability\n   echo 10 >/sys/kernel/debug/fail_io_timeout/times\n3. read/write dm\n4. iscsiadm -m node -u\n\nResult: hang task like below\n[  862.243768] INFO: task kworker/u514:2:151 blocked for more than 122 seconds.\n[  862.244133]       Tainted: G            E       6.19.0-rc1+ #51\n[  862.244337] \"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\n[  862.244718] task:kworker/u514:2  state:D stack:0     pid:151   tgid:151   ppid:2      task_flags:0x4288060 flags:0x00080000\n[  862.245024] Workqueue: iscsi_ctrl_3:1 __iscsi_unbind_session [scsi_transport_iscsi]\n[  862.245264] Call Trace:\n[  862.245587]  <TASK>\n[  862.245814]  __schedule+0x810/0x15c0\n[  862.246557]  schedule+0x69/0x180\n[  862.246760]  blk_mq_freeze_queue_wait+0xde/0x120\n[  862.247688]  elevator_change+0x16d/0x460\n[  862.247893]  elevator_set_none+0x87/0xf0\n[  862.248798]  blk_unregister_queue+0x12e/0x2a0\n[  862.248995]  __del_gendisk+0x231/0x7e0\n[  862.250143]  del_gendisk+0x12f/0x1d0\n[  862.250339]  sd_remove+0x85/0x130 [sd_mod]\n[  862.250650]  device_release_driver_internal+0x36d/0x530\n[  862.250849]  bus_remove_device+0x1dd/0x3f0\n[  862.251042]  device_del+0x38a/0x930\n[  862.252095]  __scsi_remove_device+0x293/0x360\n[  862.252291]  scsi_remove_target+0x486/0x760\n[  862.252654]  __iscsi_unbind_session+0x18a/0x3e0 [scsi_transport_iscsi]\n[  862.252886]  process_one_work+0x633/0xe50\n[  862.253101]  worker_thread+0x6df/0xf10\n[  862.253647]  kthread+0x36d/0x720\n[  862.254533]  ret_from_fork+0x2a6/0x470\n[  862.255852]  ret_from_fork_asm+0x1a/0x30\n[  862.256037]  </TASK>\n\nRemove the blk_should_fake_timeout() check from dm, as dm has no\nnative timeout handling and should not attempt to fake timeouts.",
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