---
id: CVE-2026-98345
title: |-
  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:
  …
summary: |-
  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:
  …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 <
    18d5547327c202cda33ad2bbd203220c2c62c8a7
  - >-
    Linux >= e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 <
    3ff17ffa8d02e0e3f6b2f6e57af4aac511f5b734
  - >-
    Linux >= e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 <
    c4fbcf1e614ef0755fcc751fdfca21b0bf4e0ef7
  - >-
    Linux >= e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 <
    12c0abd4d1c1b04a7663d04ba85268bc9ad9c017
  - >-
    Linux >= e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 <
    f33ad4e2f846e55cf4637419268f093ac9f1a765
  - >-
    Linux >= e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 <
    a2cdb4a675ca04c4ac8cc962848082d8ce065008
  - >-
    Linux >= e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 <
    65893c8d28f239c7ddad5a83683be193a9133e9b
  - >-
    Linux >= e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 <
    48b2c5c628b09cf36cbeca53e0432fc2a7518be7
  - Linux 2.6.31
published: '2026-10-06'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T09:18:27.480'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98345'
references:
  - url: 'https://git.kernel.org/stable/c/12c0abd4d1c1b04a7663d04ba85268bc9ad9c017'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/18d5547327c202cda33ad2bbd203220c2c62c8a7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3ff17ffa8d02e0e3f6b2f6e57af4aac511f5b734'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/48b2c5c628b09cf36cbeca53e0432fc2a7518be7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/65893c8d28f239c7ddad5a83683be193a9133e9b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a2cdb4a675ca04c4ac8cc962848082d8ce065008'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c4fbcf1e614ef0755fcc751fdfca21b0bf4e0ef7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f33ad4e2f846e55cf4637419268f093ac9f1a765'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-06T08:50:17.398Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.