CVE-2026-98345 is a vulnerability in Linux Kernel
Published on October 6, 2026
wifi: cfg80211: check IP header size in cfg80211_classify8021d()
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.
Products Associated with CVE-2026-98345
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Affected Versions
Linux:- Version e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 and below 18d5547327c202cda33ad2bbd203220c2c62c8a7 is affected.
- Version e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 and below 3ff17ffa8d02e0e3f6b2f6e57af4aac511f5b734 is affected.
- Version e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 and below c4fbcf1e614ef0755fcc751fdfca21b0bf4e0ef7 is affected.
- Version e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 and below 12c0abd4d1c1b04a7663d04ba85268bc9ad9c017 is affected.
- Version e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 and below f33ad4e2f846e55cf4637419268f093ac9f1a765 is affected.
- Version e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 and below a2cdb4a675ca04c4ac8cc962848082d8ce065008 is affected.
- Version e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 and below 65893c8d28f239c7ddad5a83683be193a9133e9b is affected.
- Version e31a16d6f64ef0e324c6f54d5112703c3f13a9c4 and below 48b2c5c628b09cf36cbeca53e0432fc2a7518be7 is affected.
- Version 2.6.31 is affected.
- Before 2.6.31 is unaffected.
- Version 5.10.271, <= 5.10.* is unaffected.
- Version 5.15.222, <= 5.15.* is unaffected.
- Version 6.1.189, <= 6.1.* is unaffected.
- Version 6.6.158, <= 6.6.* is unaffected.
- Version 6.12.112, <= 6.12.* is unaffected.
- Version 6.18.54, <= 6.18.* is unaffected.
- Version 7.2.8, <= 7.2.* is unaffected.
- Version 7.3-rc4, <= * is unaffected.