Bug 2525390 (CVE-2026-80654)

Summary:	CVE-2026-80654 kernel: soc: xilinx: Shutdown and free rx mailbox channel
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:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel. An incorrect condition check during the cleanup of a mailbox receive channel in the soc: xilinx component allows the channel to remain active and receive messages even after the device has been removed. This oversight leads to a use-after-free vulnerability, where memory is accessed after it has been deallocated. Such a flaw can potentially lead to system instability, denial of service, or privilege escalation.	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 2026-08-28 07:42:34 UTC

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

soc: xilinx: Shutdown and free rx mailbox channel

A mbox rx channel is requested using mbox_request_channel_byname() in
probe. In remove callback, the rx mailbox channel is cleaned up when the
rx_chan is NULL due to incorrect condition check. The mailbox channel is
not shutdown and it can receive messages even after the device removal.
This leads to use after free. Also the channel resources are not freed.
Fix this by checking the rx_chan correctly.

Comment 1 gkamathe 2026-08-31 09:24:25 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082844-CVE-2026-80654-6c44@gregkh/T