Bug 2535308 (CVE-2026-89904)

Summary:	CVE-2026-89904 kernel: LoongArch: Fix acpi_package_ids[] array overflow
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:	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, specifically within the LoongArch architecture's handling of ACPI (Advanced Configuration and Power Interface) PPTT (Processor Properties Topology Table) data. When a LoongArch virtual machine is configured with a large number of sockets (packages), processing the PPTT ACPI table can lead to an array overflow in the `acpi_package_ids[]` array. This vulnerability could potentially allow an attacker to cause a denial of service or other undefined behavior due to memory corruption.	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 12:01:08 UTC

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

LoongArch: Fix acpi_package_ids[] array overflow

With LoongArch virt machine, a typical setting is one core per socket,
there will max 256 sockets (packages) on one VM. With PPTT acpi table,
array acpi_package_ids[] will be overflowed.

Here change the array size of acpi_package_ids[] with the max value of
MAX_PACKAGES and KVM_MAX_VCPUS.

Comment 1 gkamathe 2026-09-17 07:25:32 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89904.mbox