Bug 2559642 (CVE-2026-98957)

Summary:	CVE-2026-98957 kernel: wifi: mt76: mt7915: disable rx napi when removing device
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 MT7915 wireless driver. The driver fails to properly disable receive network polling before freeing device resources during hardware teardown or module unloading. This flaw may allow a local privileged user to induce kernel warnings and cause system instability, resulting in a denial of service (DoS).	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 2026-10-23 12:50:03 UTC

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

wifi: mt76: mt7915: disable rx napi when removing device

Unloading the mt7915e module with a MT7916 triggers multiples WARN in
__netif_napi_del_locked() and in page_pool_disable_direct_recycling()
because the driver does not disable the napi before destroying it.

This is troublesome since on MT7916 it is required to unload the module
and reinsert it with a different enable_6ghz parameter to change the
frequency.  The system generally becomes unstable after reinserting the
module.

Fix it by disabling rx napi inside mt7915e itself, even through napi rx is
enabled in the mt76 generic code.  Disabling it in the mt76 generic code
was previously attempted and reverted because napi was disabled too
late and rx handlers could access freed structures.  Note that the tx
side is enabled and disabled by the mt76 generic code.

It is disabled in mt7915_stop_hardware() since, unlike
mt7915_unregister_device(), is it also called in the probe path if an
error happens after rx napi is enabled.