Bug 2540505 (CVE-2026-93791)

Summary:	CVE-2026-93791 kernel: wifi: iwlwifi: mvm: add a check on the tid coming from the firmware
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 iwlwifi wireless driver. This vulnerability can lead to a Denial of Service (DoS) or kernel memory corruption due to an out-of-bounds memory access. When handling block acknowledgment notifications, the driver directly uses a traffic identifier (TID) provided by the device firmware as an array index without bounds validation. A compromised or malicious Wi-Fi firmware could send an invalid identifier, causing an out-of-bounds read or write that crashes the system.	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 2026-09-24 17:03:21 UTC

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

wifi: iwlwifi: mvm: add a check on the tid coming from the firmware

ba_notif->tid is a firmware-controlled u8 that is used directly
as an array index into tid_data[] without any validation. Add a
bounds check against IWL_MAX_TID_COUNT before dereferencing the
array.

Comment 1 Mauro Matteo Cascella 2026-09-28 11:07:45 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93791.mbox