What’s Vulnerable › Vulnerabilities

CVE-2026-98345: wifi: cfg80211: check IP header size in cfg80211_classify8021d()

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-06 · updated 2026-10-19

Description

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.

Affected products

• Linux kernel: 2.6.31 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/12c0abd4d1c1b04a7663d04ba85268bc9ad9c017
• https://git.kernel.org/stable/c/18d5547327c202cda33ad2bbd203220c2c62c8a7
• https://git.kernel.org/stable/c/3ff17ffa8d02e0e3f6b2f6e57af4aac511f5b734
• https://git.kernel.org/stable/c/48b2c5c628b09cf36cbeca53e0432fc2a7518be7
• https://git.kernel.org/stable/c/65893c8d28f239c7ddad5a83683be193a9133e9b
• https://git.kernel.org/stable/c/a2cdb4a675ca04c4ac8cc962848082d8ce065008
• https://git.kernel.org/stable/c/c4fbcf1e614ef0755fcc751fdfca21b0bf4e0ef7
• https://git.kernel.org/stable/c/f33ad4e2f846e55cf4637419268f093ac9f1a765

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