Bug 2516687 (CVE-2026-72168)

Summary:	CVE-2026-72168 kernel: mtd: maps: vmu-flash: fix fault in unaligned fixup
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
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Doc Text:	A flaw was found in the Linux kernel's Memory Technology Device (MTD) subsystem, specifically within the `vmu-flash` driver. This vulnerability arises from incorrect memory allocation, where `kmalloc_obj()` was used instead of `kzalloc_obj()` for `memcard` structures. This can lead to access of uninitialized data, resulting in a runtime error and potentially a denial of service (DoS) for the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-08-15 06:25:50 UTC

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

mtd: maps: vmu-flash: fix fault in unaligned fixup

Use kzalloc_obj() / kzalloc_objs() to allocate the memcard structs,
instead of kmalloc_obj() / kmalloc_objs() to prevent access to
uninitialized data.

Fixes runtime error: Fault in unaligned fixup: 0000 [#1] at
mtd_get_fact_prot_info.

Comment 1 Keith Grant 2026-08-18 13:48:09 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081537-CVE-2026-72168-4618@gregkh/T