🛡️ CVE-2026-43314 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

dm: remove fake timeout to avoid leak request

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2026-43314 is recorded against 3 packages.

  • kernel (from 6.19.0 up to 6.19.6)
  • linux-kernel (from 6.19 up to 6.19.6)
  • unknown

Timeline and source

Published on 8 May 2026 and last revised on 22 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-43314 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-05-08
Updated 2026-08-12
Modified 2026-07-22

Affected Packages

Software From version Fixed in
kernel 6.19.0 6.19.6
linux-kernel 6.19 6.19.6
unknown — —

References

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