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

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: 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.

Timeline

1. Oct 6, 2026, 8:46 AM UTCCVE published
2. Oct 19, 2026, 9:17 AM UTCRecord last updated

Affected versions

• Linux Linux

  From e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 · fixed in 18d5547327c202cda33ad2bbd203220c2c62c8a7; From e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 · fixed in 3ff17ffa8d02e0e3f6b2f6e57af4aac511f5b734; From e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 · fixed in c4fbcf1e614ef0755fcc751fdfca21b0bf4e0ef7; From e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 · fixed in 12c0abd4d1c1b04a7663d04ba85268bc9ad9c017; From e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 · fixed in f33ad4e2f846e55cf4637419268f093ac9f1a765; From e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 · fixed in a2cdb4a675ca04c4ac8cc962848082d8ce065008; From e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 · fixed in 65893c8d28f239c7ddad5a83683be193a9133e9b; From e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 · fixed in 48b2c5c628b09cf36cbeca53e0432fc2a7518be7

• Linux Linux

  2.6.31

• KernelLinux

  From 2.6.31 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.54; From 6.19.0 · fixed in 7.2.8

References 8