Bug 2536188 (CVE-2026-90378)

Summary:	CVE-2026-90378 kernel: wifi: mt76: mt792x: Fix memory leak in SDIO TX path
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 `mt76` wireless driver, specifically in the `mt792x` SDIO TX path. When the `tx_prepare_skb()` function fails to prepare a socket buffer (skb) for transmission, the skb is not properly released. This memory leak can lead to resource exhaustion, potentially causing a denial of service (DoS) for the system.	Story Points:	---
Clone Of:		Environment:
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Regression:	---	Mount Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-09-17 16:42:31 UTC

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

wifi: mt76: mt792x: Fix memory leak in SDIO TX path

When tx_prepare_skb() returns an error in the SDIO TX path, the
skb is not freed, leading to a memory leak. This can occur when
zero-length frames (such as WNM NULL frames) are dropped to prevent
potential hardware TX hangs.

Fix this by properly releasing the skb with ieee80211_tx_status_ext()
when tx_prepare_skb() fails.

Comment 1 gkamathe 2026-09-22 10:27:44 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90378.mbox