Bug 2559561 (CVE-2026-98889)

Summary:	CVE-2026-98889 kernel: wifi: iwlwifi: mvm: fix sched scan IE sizing
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 Intel Wi-Fi driver (iwlwifi). During scheduled network scans, the driver copies Information Elements (IEs)—data fields used in wireless communications—into a fixed-size buffer before validating their length. A local user with network administration privileges can exploit this flaw by submitting oversized scan parameters, causing a buffer overflow. This flaw can lead to a Denial of Service (DoS) by crashing the system or potentially allow arbitrary code execution.	Story Points:	---
Clone Of:		Environment:
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Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-10-23 11:58:57 UTC

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

wifi: iwlwifi: mvm: fix sched scan IE sizing

Scheduled scan built the probe request before iwl_mvm_scan_fits(),
so oversized IEs could be copied into the fixed preq buffer before
length validation. Move iwl_mvm_build_scan_probe() after the fits
check.

Also advertise max_sched_scan_ie_len using iwl_mvm_max_scan_ie_len()
so userspace limits account for driver-inserted DS/TPC bytes.

Comment 1 Mauro Matteo Cascella 2026-10-26 13:12:36 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98889.mbox