Bug 2516675 (CVE-2026-72328)

Summary:	CVE-2026-72328 kernel: accel/amdxdna: Fix potential amdxdna_umap lifetime race
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:	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 `accel/amdxdna` component. A race condition exists where the `aie2_populate_range()` function can attempt to use an `amdxdna_umap` object that is simultaneously being released. This concurrent access may lead to a use-after-free vulnerability, which could result in denial of service or potentially privilege escalation.	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 06:25:16 UTC

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

accel/amdxdna: Fix potential amdxdna_umap lifetime race

amdxdna_umap_release() calls the blocking mmu_interval_notifier_remove()
before removing the object from abo->mem.umap_list. If
aie2_populate_range() runs concurrently, it may obtain a reference to an
amdxdna_umap that is being released, leading to a potential use-after-free.

Use kref_get_unless_zero() in aie2_populate_range() when acquiring a
reference. If the reference count has already dropped to zero, release
is in progress and the entry is skipped.

Comment 1 Keith Grant 2026-08-18 21:11:31 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081507-CVE-2026-72328-4c7f@gregkh/T