Bug 2555114 (CVE-2026-98700)

Summary:	CVE-2026-98700 kernel: wifi: mac80211: set info->band for 802.3 encap offload frames
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. The transmission function for encapsulated Ethernet frames fails to set the operating frequency band from the channel context on non-Multi-Link Device (MLD) interfaces. A local user generating network traffic on an affected interface can trigger this flaw, causing the system to calculate transmission rates using an incorrect band. Consequently, this issue may result in transmission failures or degraded wireless network performance.	Story Points:	---
Clone Of:		Environment:
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-10-18 15:55:14 UTC

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

wifi: mac80211: set info->band for 802.3 encap offload frames

Unlike the 802.11 TX paths, ieee80211_8023_xmit() does not set
info->band from the channel context on non-MLD interfaces. It stays at
0, so ieee80211_get_tx_rates() uses the wrong band for these frames.

Set it the same way as ieee80211_build_hdr(): drop the frame if there is
no channel context, and leave the band at 0 on MLD interfaces.

Comment 1 Mauro Matteo Cascella 2026-10-22 05:06:20 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98700.mbox