{"id":"CVE-2026-43314","title":"dm: remove fake timeout to avoid leak request","summary":"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 …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= e6ee8c0b767540f59e20da3ced282601db8aa502 < ece6720de9403260088209b0b92d45e0b49ff856","Linux >= e6ee8c0b767540f59e20da3ced282601db8aa502 < 8200fca818c1e2f65bc6cb16d934ff6049302197","Linux >= e6ee8c0b767540f59e20da3ced282601db8aa502 < b307b6307f6459841312432bd4bc9519cbac97f5","Linux >= e6ee8c0b767540f59e20da3ced282601db8aa502 < 4f9e7ca933a9fbf9912a384b061a00c77332cbf0","Linux >= e6ee8c0b767540f59e20da3ced282601db8aa502 < cf2d06c9fd4b6521ea5b7f73c99c64c2c6f5e224","Linux >= e6ee8c0b767540f59e20da3ced282601db8aa502 < 6cdb21e0c9fdee484feba14fc9e72e9d07daf9f3","Linux >= e6ee8c0b767540f59e20da3ced282601db8aa502 < c8a23d4c995ef4227bd4de64cd3910637ee6162e","Linux >= e6ee8c0b767540f59e20da3ced282601db8aa502 < f3a9c95a15d2f4466acad5c68faeff79ca5e9f47","Linux 2.6.31"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T15:35:18.482577Z"},"published":"2026-05-08","updated":"2026-11-06","sourceUpdated":"2026-11-06T15:42:48.183Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43314","references":[{"url":"https://git.kernel.org/stable/c/ece6720de9403260088209b0b92d45e0b49ff856"},{"url":"https://git.kernel.org/stable/c/8200fca818c1e2f65bc6cb16d934ff6049302197"},{"url":"https://git.kernel.org/stable/c/b307b6307f6459841312432bd4bc9519cbac97f5"},{"url":"https://git.kernel.org/stable/c/4f9e7ca933a9fbf9912a384b061a00c77332cbf0"},{"url":"https://git.kernel.org/stable/c/cf2d06c9fd4b6521ea5b7f73c99c64c2c6f5e224"},{"url":"https://git.kernel.org/stable/c/6cdb21e0c9fdee484feba14fc9e72e9d07daf9f3"},{"url":"https://git.kernel.org/stable/c/c8a23d4c995ef4227bd4de64cd3910637ee6162e"},{"url":"https://git.kernel.org/stable/c/f3a9c95a15d2f4466acad5c68faeff79ca5e9f47"}],"tags":["cve.org"],"epss":0.00138,"epssPercentile":0.03242,"ingestedAt":"2026-11-06T15:54:03.939Z","slug":"CVE-2026-43314","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= e6ee8c0b767540f59e20da3ced282601db8aa502 < ece6720de9403260088209b0b92d45e0b49ff856`\n- `Linux >= e6ee8c0b767540f59e20da3ced282601db8aa502 < 8200fca818c1e2f65bc6cb16d934ff6049302197`\n- `Linux >= e6ee8c0b767540f59e20da3ced282601db8aa502 < b307b6307f6459841312432bd4bc9519cbac97f5`\n- `Linux >= e6ee8c0b767540f59e20da3ced282601db8aa502 < 4f9e7ca933a9fbf9912a384b061a00c77332cbf0`\n- `Linux >= e6ee8c0b767540f59e20da3ced282601db8aa502 < cf2d06c9fd4b6521ea5b7f73c99c64c2c6f5e224`\n- `Linux >= e6ee8c0b767540f59e20da3ced282601db8aa502 < 6cdb21e0c9fdee484feba14fc9e72e9d07daf9f3`\n- `Linux >= e6ee8c0b767540f59e20da3ced282601db8aa502 < c8a23d4c995ef4227bd4de64cd3910637ee6162e`\n- `Linux >= e6ee8c0b767540f59e20da3ced282601db8aa502 < f3a9c95a15d2f4466acad5c68faeff79ca5e9f47`\n- `Linux 2.6.31`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}