Bug 2516450 (CVE-2026-72143)

Summary:	CVE-2026-72143 kernel: platform/x86: ISST: Restore SST-PP control to all domains
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 Intel Speed Select Technology (ISST) power management component for x86 platforms. When a system resumes from suspend, the SST-PP control settings for all power domains are not fully restored, affecting only power domain 0. This occurs due to an incorrect base address being used during the restore process, which could lead to unexpected system behavior or suboptimal power management for other power domains.	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 2026-08-15 06:13:11 UTC

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

platform/x86: ISST: Restore SST-PP control to all domains

The SST-PP control offset is only restored to power domain 0 after
resume. During suspend, control values are read and stored for all
power domains.

Use pd_info->sst_base instead of power_domain_info->sst_base, which
only points to power domain 0 base address.

Comment 1 Keith Grant 2026-08-18 12:22:44 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081532-CVE-2026-72143-fed4@gregkh/T