Bug 2536560 (CVE-2026-93041)

Summary:	CVE-2026-93041 kernel: dmaengine: dw-edma: Serialize abort state updates
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:	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 dw-edma component. A race condition exists where the `dw_edma_abort_interrupt()` function prematurely releases a lock, allowing the `issue_pending()` function to access outdated Direct Memory Access (DMA) channel status information. This can lead to new DMA descriptors being stranded, potentially causing a denial of service by preventing further DMA operations.	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 2026-09-17 18:24:42 UTC

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

dmaengine: dw-edma: Serialize abort state updates

dw_edma_abort_interrupt() drops vc.lock before changing request and
status. issue_pending() can acquire the lock in that small window,
observe the old busy state, and skip starting queued descriptors. Then
the abort handler overwrites the channel status as idle, leaving the new
descriptors stranded for good.

Keep descriptor completion and the state transition in the same critical
section.

Comment 1 gkamathe 2026-09-19 19:09:45 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93041.mbox