Bug 2525410 (CVE-2026-80635)

Summary:	CVE-2026-80635 kernel: wifi: wcn36xx: fix OOB read from short trigger BA firmware response
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:	rhel-process-autobot, 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 wcn36xx Wi-Fi driver. This vulnerability occurs because the driver does not adequately validate the length of certain firmware responses. An attacker could potentially craft a malicious firmware response, leading to an out-of-bounds read of stale heap data. This can result in the corruption of the Block Acknowledgement (BA) session state, potentially causing a denial of service or information disclosure.	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 2026-08-28 07:43:35 UTC

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

wifi: wcn36xx: fix OOB read from short trigger BA firmware response

The firmware response length is only checked against sizeof(*rsp) (20
bytes), but when candidate_cnt >= 1, a 22-byte candidate struct is read
at buf + 20 without verifying the response contains it. This causes an
out-of-bounds read of stale heap data, corrupting the BA session state.

Add validation that the response includes the candidate data.

Comment 1 gkamathe 2026-08-31 11:31:05 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082839-CVE-2026-80635-6b91@gregkh/T