Bug 2468170 (CVE-2026-43399)

Summary:	CVE-2026-43399 kernel: drm/amdgpu/userq: Fix reference leak in amdgpu_userq_wait_ioctl
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	unspecified	Docs Contact:
Priority:	unspecified
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 AMD GPU (amdgpu) driver. Specifically, a reference leak occurs in the `amdgpu_userq_wait_ioctl` function. This issue arises when an I/O control (ioctl) operation is aborted because the output array provided is insufficient. A local attacker could exploit this to cause resource exhaustion, leading to a denial of service (DoS) on the system.	Story Points:	---
Clone Of:		Environment:
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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 2026-05-08 15:02:50 UTC

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

drm/amdgpu/userq: Fix reference leak in amdgpu_userq_wait_ioctl

Drop reference to syncobj and timeline fence when aborting the ioctl due
output array being too small.

(cherry picked from commit 68951e9c3e6bb22396bc42ef2359751c8315dd27)

Comment 1 Keith Grant 2026-05-08 22:02:20 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050839-CVE-2026-43399-6521@gregkh/T