CVE-2026-43314

/// Technical description

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] T

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References