Bug 2540350 (CVE-2026-93281)

Summary:	CVE-2026-93281 kernel: wifi: rtw89: fix HE extended capability length check
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 Realtek Wi-Fi driver (rtw89). This vulnerability may allow an attacker within wireless range to cause a Denial of Service (DoS) via a system crash. By transmitting a crafted wireless frame with malformed capability information, an attacker can trigger an improper length check leading to an out-of-bounds memory read.	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 16:23:44 UTC

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

wifi: rtw89: fix HE extended capability length check

rtw89_mac_check_he_obss_narrow_bw_ru_iter() reads extended capability
byte 10, but rejects only datalen values below 10.  Byte 10 requires at
least 11 bytes.

Require datalen >= 11 before reading data[10].

Comment 1 gkamathe 2026-09-28 13:36:37 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93281.mbox