Bug 2546502 (CVE-2026-98345)

Summary:	CVE-2026-98345 kernel: wifi: cfg80211: check IP header size in cfg80211_classify8021d()
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 cfg80211 wireless subsystem. A local attacker can cause a Denial of Service (DoS) by transmitting crafted network frames that appear to be Internet Protocol (IP) traffic. Because the kernel fails to verify that the frame is large enough to hold a complete header before reading traffic priority fields, it reads uninitialized memory, potentially crashing 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 2026-10-06 09:35:09 UTC

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

wifi: cfg80211: check IP header size in cfg80211_classify8021d()

A frame that looks like IP can be transmitted, but be too short, so
the DS field is read incorrectly:

  BUG: KMSAN: uninit-value in cfg80211_classify8021d+0x99d/0x12b0 net/wireless/util.c:1027
   cfg80211_classify8021d+0x99d/0x12b0 net/wireless/util.c:1027
   ieee80211_select_queue+0x37a/0x9e0 net/mac80211/wme.c:180
   __ieee80211_subif_start_xmit+0x60f/0x1d90 net/mac80211/tx.c:4304
   ieee80211_subif_start_xmit+0xa8/0x6d0 net/mac80211/tx.c:4538
   ...
   packet_sendmsg+0x9173/0xa2a0 net/packet/af_packet.c:3108

Use skb_header_pointer() like the MPLS case.

Comment 1 gkamathe 2026-10-10 13:41:20 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98345.mbox