Bug 2420411 (CVE-2025-40330)

Summary:	CVE-2025-40330 kernel: bnxt_en: Shutdown FW DMA in bnxt_shutdown()
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's Broadcom NetXtreme-C/E (bnxt_en) network driver. During system shutdown via bnxt_shutdown(), only packet DMA is stopped through netif_close(), but firmware DMA operations for trace logging continue. If the system performs a kexec to boot a new kernel, the ongoing firmware DMA writes corrupt memory in the new kernel, potentially leading to system crashes, data corruption, or security vulnerabilities in the newly booted kernel.	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 2025-12-09 05:01:34 UTC

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

bnxt_en: Shutdown FW DMA in bnxt_shutdown()

The netif_close() call in bnxt_shutdown() only stops packet DMA.  There
may be FW DMA for trace logging (recently added) that will continue.  If
we kexec to a new kernel, the DMA will corrupt memory in the new kernel.

Add bnxt_hwrm_func_drv_unrgtr() to unregister the driver from the FW.
This will stop the FW DMA.  In case the call fails, call pcie_flr() to
reset the function and stop the DMA.

Comment 1 Alexander B 2025-12-09 14:17:15 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120910-CVE-2025-40330-d2a2@gregkh/T