Bug 2546404 (CVE-2026-98179)

Summary:	CVE-2026-98179 kernel: drm/amdgpu: fix rmmio iounmap skipped on device removal
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:	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's AMD GPU (amdgpu) driver. This issue can lead to a Denial of Service (DoS) caused by resource exhaustion during device removal or driver unloading. Because the cleanup routine fails to release mapped input/output (I/O) register memory, a privileged local user could repeatedly reload the driver or remove devices to leak memory until system resources are exhausted.	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 2026-10-06 09:15:32 UTC

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

drm/amdgpu: fix rmmio iounmap skipped on device removal

amdgpu_pci_remove() calls drm_dev_unplug() before fini_sw(), so
drm_dev_enter() is already false there and the iounmap() guarded by it
is skipped. This .remove path runs on both hot-unplug and plain rmmod,
so the register BAR ioremap mapping leaks one instance per unload.

Unmap rmmio unconditionally (guard only on non-NULL) and drop the now
unused idx.

(cherry picked from commit dd6f86a97260e5207d3329ad03aa89fdad61b1e6)

Comment 1 Mauro Matteo Cascella 2026-10-08 12:01:52 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98179.mbox