Bug 2546502 (CVE-2026-98345) - CVE-2026-98345 kernel: wifi: cfg80211: check IP header size in cfg80211_classify8021d()
Summary: CVE-2026-98345 kernel: wifi: cfg80211: check IP header size in cfg80211_class...
Keywords:
Status: NEW
Alias: CVE-2026-98345
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-06 09:35 UTC by OSIDB Bzimport
Modified: 2026-10-10 13:49 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
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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
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