---
id: CVE-2026-43314
title: 'dm: remove fake timeout to avoid leak request'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  dm: remove fake timeout to avoid leak request

  Since commit 15f73f5b3e59 ("blk-mq: move failure injection out of
  blk_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'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

dm: remove fake timeout to avoid leak request

Since commit 15f73f5b3e59 ("blk-mq: move failure injection out of
blk_mq_complete_request"), drivers are responsible for calling
blk_should_fake_timeout() at appropriate code paths and opportunities.

However, the dm driver does not implement its own timeout handler and
relies on the timeout handling of its slave devices.

If an io-timeout-fail error is injected to a dm device, the request
will be leaked and never completed, causing tasks to hang indefinitely.

Reproduce:
1. prepare dm which has iscsi slave device
2. inject io-timeout-fail to dm
   echo 1 >/sys/class/block/dm-0/io-timeout-fail
   echo 100 >/sys/kernel/debug/fail_io_timeout/probability
   echo 10 >/sys/kernel/debug/fail_io_timeout/times
3. read/write dm
4. iscsiadm -m node -u

Result: hang task like below
[  862.243768] INFO: task kworker/u514:2:151 blocked for more than 122 seconds.
[  862.244133]       Tainted: G            E       6.19.0-rc1+ #51
[  862.244337] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  862.244718] task:kworker/u514:2  state:D stack:0     pid:151   tgid:151   ppid:2      task_flags:0x4288060 flags:0x00080000
[  862.245024] Workqueue: iscsi_ctrl_3:1 __iscsi_unbind_session [scsi_transport_iscsi]
[  862.245264] Call Trace:
[  862.245587]  <TASK>
[  862.245814]  __schedule+0x810/0x15c0
[  862.246557]  schedule+0x69/0x180
[  862.246760]  blk_mq_freeze_queue_wait+0xde/0x120
[  862.247688]  elevator_change+0x16d/0x460
[  862.247893]  elevator_set_none+0x87/0xf0
[  862.248798]  blk_unregister_queue+0x12e/0x2a0
[  862.248995]  __del_gendisk+0x231/0x7e0
[  862.250143]  del_gendisk+0x12f/0x1d0
[  862.250339]  sd_remove+0x85/0x130 [sd_mod]
[  862.250650]  device_release_driver_internal+0x36d/0x530
[  862.250849]  bus_remove_device+0x1dd/0x3f0
[  862.251042]  device_del+0x38a/0x930
[  862.252095]  __scsi_remove_device+0x293/0x360
[  862.252291]  scsi_remove_target+0x486/0x760
[  862.252654]  __iscsi_unbind_session+0x18a/0x3e0 [scsi_transport_iscsi]
[  862.252886]  process_one_work+0x633/0xe50
[  862.253101]  worker_thread+0x6df/0xf10
[  862.253647]  kthread+0x36d/0x720
[  862.254533]  ret_from_fork+0x2a6/0x470
[  862.255852]  ret_from_fork_asm+0x1a/0x30
[  862.256037]  </TASK>

Remove the blk_should_fake_timeout() check from dm, as dm has no
native timeout handling and should not attempt to fake timeouts.

## 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`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.