Bug 2493759 (CVE-2026-53295)

Summary:	CVE-2026-53295 kernel: mailbox: add sanity check for channel array
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
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's mailbox component. This vulnerability arises from an insufficient sanity check for the channel array. When a mailbox controller is initialized without an attached channel array, a subsequent operation can lead to a null pointer dereference, causing a kernel crash. This could result in a denial of service for the affected 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 2026-06-26 21:05:41 UTC

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

mailbox: add sanity check for channel array

Fail gracefully if there is no channel array attached to the mailbox
controller. Otherwise the later dereference will cause an OOPS which
might not be seen because mailbox controllers might instantiate very
early. Remove the comment explaining the obvious while here.

Comment 1 Mauro Matteo Cascella 2026-06-29 08:27:23 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062617-CVE-2026-53295-770b@gregkh/T