Bug 2486994 (CVE-2026-46327)

Summary:	CVE-2026-46327 kernel: dm: fix unlocked test for dm_suspended_md
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in the Linux kernel's device mapper (dm) component. The `dm_blk_report_zones` function performs a check for the device's suspended state without proper locking. This allows the device to enter a suspended state immediately after the check, leading to an inconsistent state. This inconsistency could potentially result in unexpected system behavior or a denial of service (DoS) condition.	Story Points:	---
Clone Of:		Environment:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-06-09 14:01:15 UTC

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

dm: fix unlocked test for dm_suspended_md

The function dm_blk_report_zones tests if the device is suspended with
the "dm_suspended_md" call. However, this function is called without
holding any locks, so the device may be suspended just after it.

Move the call to dm_suspended_md after dm_get_live_table, so that the
device can't be suspended after the suspended state was tested.

Comment 1 Keith Grant 2026-06-09 16:47:37 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026060909-CVE-2026-46327-aaef@gregkh/T