Bug 2524420 (CVE-2026-80547)

Summary:	CVE-2026-80547 kernel: s390/vfio_ccw: Implement a crw lock
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
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
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Doc Text:	A flaw was found in the Linux kernel's `s390/vfio_ccw` component. This vulnerability arises from the lack of a proper lock to manage the list of Channel Report Word (CRW) payloads, which are asynchronous events from hardware. Without this lock, these payloads may not be read cohesively, potentially leading to data inconsistency or unexpected system behavior.	Story Points:	---
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Last Closed:		Type:	---
Regression:	---	Mount 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 2026-08-26 14:47:29 UTC

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

s390/vfio_ccw: Implement a crw lock

Unlike the channel_program struct, which covers synchronous I/O
submissions and asynchronous interrupts, the CRW region relies
exclusively on asynchronous events coming from hardware.

Implement a lock to manage the list of those payloads, to ensure
they are read cohesively.

Comment 1 gkamathe 2026-08-27 05:49:22 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082607-CVE-2026-80547-4c7e@gregkh/T