Bug 2536746 (CVE-2026-90354)

Summary:	CVE-2026-90354 kernel: wifi: mt76: mt7915: fix double hif2 init on the non-WED path
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
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 mt76 Wi-Fi driver, specifically in the mt7915 component. The mt7915_pci_init_hif2() function was called unconditionally twice during initialization on non-WED dual-hif hardware. This double initialization led to a leaked device reference, which is a pointer to a hardware resource, and the PCIe RECOG_ID register being written twice. This issue can result in a resource leak, potentially affecting system stability over time.	Story Points:	---
Clone Of:		Environment:
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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 19:24:02 UTC

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

wifi: mt76: mt7915: fix double hif2 init on the non-WED path

mt7915_pci_init_hif2() was called unconditionally and again inside the
WED-inactive branch. The helper increments the global hif_idx, writes the
PCIe RECOG_ID register and takes a get_device() reference via
mt7915_pci_get_hif2(), while removal only drops one reference. On non-WED
dual-hif hardware this double-incremented hif_idx, wrote RECOG_ID twice and
leaked a device reference. Only the call inside the WED-inactive branch is
correct; drop the unconditional one. hif2 is already initialised to NULL.

Comment 1 gkamathe 2026-09-22 06:54:56 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90354.mbox