Bug 2467200 (CVE-2026-43155)

Summary:	CVE-2026-43155 kernel: mux: mmio: fix regmap leak on probe failure
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	unspecified	Docs Contact:
Priority:	unspecified
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 mux: mmio subsystem of the Linux kernel. During device probing, specifically on probe failures such as probe deferral or driver unbind, a memory-mapped input/output (mmio) regmap resource may not be properly freed. This resource leak can lead to system instability or a Denial of Service (DoS) due to resource exhaustion.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-05-06 13:10:27 UTC

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

mux: mmio: fix regmap leak on probe failure

The mmio regmap that may be allocated during probe is never freed.

Switch to using the device managed allocator so that the regmap is
released on probe failures (e.g. probe deferral) and on driver unbind.

Comment 1 Keith Grant 2026-05-06 19:03:14 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050630-CVE-2026-43155-32e0@gregkh/T