Bug 2484476 (CVE-2026-46249)

Summary:	CVE-2026-46249 kernel: octeontx2-af: Fix PF driver crash with kexec kernel booting
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
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 octeontx2-af PF driver. This vulnerability occurs during a kexec reboot when the hardware is not power-cycled, causing the AF state from the old kernel to persist. If the RVUM block revision is not cleared during AF shutdown, the PF driver may incorrectly assume the AF is ready and access stale hardware state. This can lead to a system crash, resulting in a Denial of Service (DoS).	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 2026-06-03 18:03:19 UTC

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

octeontx2-af: Fix PF driver crash with kexec kernel booting

During a kexec reboot the hardware is not power-cycled, so AF state from
the old kernel can persist into the new kernel. When AF and PF drivers
are built as modules, the PF driver may probe before AF reinitializes
the hardware.

The PF driver treats the RVUM block revision as an indication that AF
initialization is complete. If this value is left uncleared at shutdown,
PF may incorrectly assume AF is ready and access stale hardware state,
leading to a crash.

Clear the RVUM block revision during AF shutdown to avoid PF
mis-detecting AF readiness after kexec.

Comment 1 Keith Grant 2026-06-03 18:58:43 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026060334-CVE-2026-46249-ade7@gregkh/T