PT-2024-11473 · Linux+4 · Linux Kernel+4
Mike Snitzer
+1
·
Published
2021-09-23
·
Updated
2026-03-14
·
CVE-2021-47498
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
The issue is related to the Linux kernel, where a vulnerability has been resolved. The vulnerability is associated with the device mapper (DM) and its interaction with the block multiqueue (blk-mq) subsystem. Specifically, the DM uses blk-mq's quiesce/unquiesce mechanism to stop and start the device mapper queue. However, the unquiesce operation may be triggered by outside events, such as elevator switches or updates to nr requests, which can cause requests to be queued during suspend. To address this, the fix involves asking blk-mq to requeue the request. This resolves a kernel panic issue that occurs when running the updating nr requests and dm-mpath suspend/resume stress test.
Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
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Weakness Enumeration
Related Identifiers
Affected Products
Centos
Debian
Linux Kernel
Red Hat
Suse