CVE-2026-98345: Linux kernel · wifi: cfg80211: check IP header size in cfg80211_classify8021d()
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 28 Oct 2026, 01:28 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 6 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
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.
References
- ubuntu.com/security/CVE-2026-98345 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98345 (opens in a new tab)
- git.kernel.org/linus/48b2c5c628b09cf36cbeca53e0432fc2a7518be7 (opens in a new tab)
- git.kernel.org/stable/c/12c0abd4d1c1b04a7663d04ba85268bc9ad9c017 (opens in a new tab)
- git.kernel.org/stable/c/18d5547327c202cda33ad2bbd203220c2c62c8a7 (opens in a new tab)
- git.kernel.org/stable/c/3ff17ffa8d02e0e3f6b2f6e57af4aac511f5b734 (opens in a new tab)
- git.kernel.org/stable/c/48b2c5c628b09cf36cbeca53e0432fc2a7518be7 (opens in a new tab)
- git.kernel.org/stable/c/65893c8d28f239c7ddad5a83683be193a9133e9b (opens in a new tab)
- git.kernel.org/stable/c/a2cdb4a675ca04c4ac8cc962848082d8ce065008 (opens in a new tab)
- git.kernel.org/stable/c/c4fbcf1e614ef0755fcc751fdfca21b0bf4e0ef7 (opens in a new tab)
- git.kernel.org/stable/c/f33ad4e2f846e55cf4637419268f093ac9f1a765 (opens in a new tab)