CVE-2026-98345 PUBLISHED

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

Assigner: Linux
Reserved: 25.09.2026 Published: 06.10.2026 Updated: 06.10.2026

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.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 to 18d5547327c202cda33ad2bbd203220c2c62c8a7 (excl.)
  • affected from e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 to 3ff17ffa8d02e0e3f6b2f6e57af4aac511f5b734 (excl.)
  • affected from e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 to c4fbcf1e614ef0755fcc751fdfca21b0bf4e0ef7 (excl.)
  • affected from e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 to 12c0abd4d1c1b04a7663d04ba85268bc9ad9c017 (excl.)
  • affected from e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 to f33ad4e2f846e55cf4637419268f093ac9f1a765 (excl.)
  • affected from e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 to a2cdb4a675ca04c4ac8cc962848082d8ce065008 (excl.)
  • affected from e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 to 65893c8d28f239c7ddad5a83683be193a9133e9b (excl.)
  • affected from e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 to 48b2c5c628b09cf36cbeca53e0432fc2a7518be7 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 2.6.31 is affected
  • unaffected from 0 to 2.6.31 (excl.)
  • unaffected from 5.10.271 to 5.10.* (incl.)
  • unaffected from 5.15.222 to 5.15.* (incl.)
  • unaffected from 6.1.189 to 6.1.* (incl.)
  • unaffected from 6.6.158 to 6.6.* (incl.)
  • unaffected from 6.12.112 to 6.12.* (incl.)
  • unaffected from 6.18.54 to 6.18.* (incl.)
  • unaffected from 7.2.8 to 7.2.* (incl.)
  • unaffected from 7.3-rc4 to * (incl.)

References