CVE-2026-98891: Linux kernel · wifi: mac80211: validate deauth frame length before reason access
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 28 Oct 2026, 01:29 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 23 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: mac80211: validate deauth frame length before reason access ieee80211_rx_mgmt_deauth() reads the deauth reason code before checking that the fixed field is actually present in the received frame. Validate the deauth frame length first and only then read the reason code.
References
- ubuntu.com/security/CVE-2026-98891 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98891 (opens in a new tab)
- git.kernel.org/stable/c/4a360c6e18dfa9d70006c7247a6a8cc8dfe0d60f (opens in a new tab)
- git.kernel.org/stable/c/51092dc769f021e9634474e1bd5a561da477fbdb (opens in a new tab)
- git.kernel.org/stable/c/7a5ef1fd654d0e90d59aa32c881789c8bcc4125a (opens in a new tab)
- git.kernel.org/stable/c/80d1a110e9096b5bf41497f6b151154084862385 (opens in a new tab)
- git.kernel.org/stable/c/9df64ad43e1f2c036667bba2bf385e9d7b3af564 (opens in a new tab)
- git.kernel.org/stable/c/a6ed4c00ccdc15011a73daa2b38af9fc5a2c543e (opens in a new tab)
- git.kernel.org/stable/c/a78689e2beed200d4590318612c74ae25c9408cf (opens in a new tab)