Bug 2492402 (CVE-2026-53114)

Summary:	CVE-2026-53114 kernel: perf/amd/ibs: Avoid calling perf_allow_kernel() from the IBS NMI handler
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
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
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Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's performance monitoring unit (perf/amd/ibs). An issue exists where calling `perf_allow_kernel()` from a Non-Maskable Interrupt (NMI) handler is unsafe. This could lead to a system crash, resulting in a Denial of Service (DoS) for the affected system.	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 2026-06-24 18:10:20 UTC

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

perf/amd/ibs: Avoid calling perf_allow_kernel() from the IBS NMI handler

Calling perf_allow_kernel() from the NMI context is unsafe and could be
fatal. Capture the permission at event-initialization time by storing it
in event->hw.flags, and have the NMI handler rely on that cached flag
instead of making the call directly.

Comment 1 Mauro Matteo Cascella 2026-06-26 12:54:42 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062415-CVE-2026-53114-dc8b@gregkh/T