Bug 2559685 (CVE-2026-98944)

Summary:	CVE-2026-98944 kernel: kernel: Denial of Service via improper cleanup during Steam controller registration
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 Steam Controller HID (Human Interface Device) driver. This issue allows a local user to cause a Denial of Service (DoS) by triggering a device registration failure. During an unsuccessful registration sequence, the driver fails to properly unregister the battery power supply component, leaving a lingering object in memory after the device structure is torn down. Subsequent access to this dangling reference can result in memory corruption or an unexpected system crash.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-10-23 13:02:09 UTC

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

HID: steam: Refactor registration

This refactors and simplifies the registration/unregistration flow. Since
we now only perform registration when the client isn't opened anymore, the
logic for handling that can be removed, and the rest of the function
streamlined.

We also remove the previous assumption that we have a serial number to show
we're registered, replacing it with a single purpose boolean.

In a previous refactor the code for unregistering a battery if later
registration steps failed was accidentally left out. As a result, a
lingering power_supply object could get left over after the steam object
was torn down. This is also fixed here.