Bug 2552196 (CVE-2026-98421)

Summary:	CVE-2026-98421 kernel: wifi: mac80211: require a peer station for TDLS setup confirm
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
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 mac80211 wireless subsystem. A local attacker can cause a denial of service (DoS) by requesting a Tunneled Direct Link Setup (TDLS) setup confirmation for a nonexistent peer station. Because the subsystem does not verify that the peer station exists before preparing the management frame, this issue triggers an internal kernel warning that may result in system instability or a crash.	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 2026-10-14 13:43:04 UTC

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

wifi: mac80211: require a peer station for TDLS setup confirm

It's nonsense for the setup confirm to go to station that
doesn't even exist, and it hits a warning when building
the frame:

  WARN_ON_ONCE(!sta || !ap_sta)

Only accept WLAN_TDLS_SETUP_CONFIRM when the station is
already there as a TDLS station. Need to copy the call
to ieee80211_tdls_prep_mgmt_packet() since the existing
WLAN_TDLS_DISCOVERY_REQUEST already falls through to it.

Comment 1 gkamathe 2026-10-15 10:36:50 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98421.mbox