Bug 2535205 (CVE-2026-89914)

Summary:	CVE-2026-89914 kernel: KVM: arm64: Sign-extend VA for range-based TLBI invalidation
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:	akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, 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 KVM (Kernel-based Virtual Machine) component for ARM64 architectures. An omission in the `decode_range_tlbi()` helper, responsible for managing the Translation Lookaside Buffer (TLB), failed to correctly extend virtual addresses (VA) during certain invalidation operations. This could lead to an overflow of physical address (PA) bits, potentially causing incorrect memory handling. The consequence of this flaw could be system instability or, in certain scenarios, information disclosure or denial of service.	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 2026-09-16 11:27:17 UTC

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

KVM: arm64: Sign-extend VA for range-based TLBI invalidation

When the decode_range_tlbi() helper was moved to be used for S1 TLBIs,
the required sign extension was omitted. Add it.

As a result, special care must be taken to not overflow PA bits when
this is used for S2 invalidation.