Bug 2535114 (CVE-2026-89925)

Summary:	CVE-2026-89925 kernel: KVM: s390: Fix memory leak in guest debug handling
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:	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:
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Doc Text:	A flaw was found in KVM's guest debug handling within the Linux kernel. A local user, by repeatedly calling `KVM_SET_GUEST_DEBUG`, can trigger a memory leak. This occurs because the `bp_data` is not freed after a successful debug operation. Over time, this can lead to resource exhaustion and a Denial of Service (DoS) on the system.	Story Points:	---
Clone Of:		Environment:
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-09-16 10:48:35 UTC

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

KVM: s390: Fix memory leak in guest debug handling

bp_data is freed only for the error case by kfree(bp_data).
Every successful KVM_SET_GUEST_DEBUG will leak bp_data.

Comment 1 Keith Grant 2026-09-16 15:46:33 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89925.mbox