{"id":"CVE-2026-43314","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 \u003e/sys/class/block/dm-0/io-timeout-fail\n   echo 100 \u003e/sys/kernel/debug/fail_io_timeout/probability\n   echo 10 \u003e/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 \u003e /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]  \u003cTASK\u003e\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]  \u003c/TASK\u003e\n\nRemove the blk_should_fake_timeout() check from dm, as dm has no\nnative timeout handling and should not attempt to fake timeouts.","modified":"2026-06-18T03:57:09.985249812Z","published":"2026-05-08T13:11:31.068Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43314.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/4f9e7ca933a9fbf9912a384b061a00c77332cbf0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6cdb21e0c9fdee484feba14fc9e72e9d07daf9f3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8200fca818c1e2f65bc6cb16d934ff6049302197"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b307b6307f6459841312432bd4bc9519cbac97f5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c8a23d4c995ef4227bd4de64cd3910637ee6162e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cf2d06c9fd4b6521ea5b7f73c99c64c2c6f5e224"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ece6720de9403260088209b0b92d45e0b49ff856"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f3a9c95a15d2f4466acad5c68faeff79ca5e9f47"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43314.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43314"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e6ee8c0b767540f59e20da3ced282601db8aa502"},{"fixed":"ece6720de9403260088209b0b92d45e0b49ff856"},{"fixed":"8200fca818c1e2f65bc6cb16d934ff6049302197"},{"fixed":"b307b6307f6459841312432bd4bc9519cbac97f5"},{"fixed":"4f9e7ca933a9fbf9912a384b061a00c77332cbf0"},{"fixed":"cf2d06c9fd4b6521ea5b7f73c99c64c2c6f5e224"},{"fixed":"6cdb21e0c9fdee484feba14fc9e72e9d07daf9f3"},{"fixed":"c8a23d4c995ef4227bd4de64cd3910637ee6162e"},{"fixed":"f3a9c95a15d2f4466acad5c68faeff79ca5e9f47"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43314.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.31"},{"fixed":"5.10.252"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.202"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.165"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.128"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.75"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.16"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43314.json"}}],"schema_version":"1.7.5"}