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CVE-2026-98891VulnerabilityPublished Updated

Microsoft · wifi: mac80211: validate deauth frame length before reason access

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-98891

Not known to be exploited · fixed in a78689e2beed200d4590318612c74ae25c9408cf : update Microsoft when convenient.

Data as of 2 Nov 2026, 10:58 UTC

Severity
Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
EPSS
0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in a78689e2beed200d4590318612c74ae25c9408cf, a6ed4c00ccdc15011a73daa2b38af9fc5a2c543e, 51092dc769f021e9634474e1bd5a561da477fbdb +4

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 23 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 2 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ c9c99f8938e41b878802d5d8481d6f7a212515b0, < a78689e2beed200d4590318612c74ae25c9408cf
Fixed in
  • a78689e2beed200d4590318612c74ae25c9408cf
LinuxLinuxAffected
  • ≥ c9c99f8938e41b878802d5d8481d6f7a212515b0, < a6ed4c00ccdc15011a73daa2b38af9fc5a2c543e
Fixed in
  • a6ed4c00ccdc15011a73daa2b38af9fc5a2c543e
LinuxLinuxAffected
  • ≥ c9c99f8938e41b878802d5d8481d6f7a212515b0, < 51092dc769f021e9634474e1bd5a561da477fbdb
Fixed in
  • 51092dc769f021e9634474e1bd5a561da477fbdb
LinuxLinuxAffected
  • ≥ c9c99f8938e41b878802d5d8481d6f7a212515b0, < 80d1a110e9096b5bf41497f6b151154084862385
Fixed in
  • 80d1a110e9096b5bf41497f6b151154084862385
LinuxLinuxAffected
  • ≥ c9c99f8938e41b878802d5d8481d6f7a212515b0, < 9df64ad43e1f2c036667bba2bf385e9d7b3af564
Fixed in
  • 9df64ad43e1f2c036667bba2bf385e9d7b3af564
LinuxLinuxAffected
  • ≥ c9c99f8938e41b878802d5d8481d6f7a212515b0, < 7a5ef1fd654d0e90d59aa32c881789c8bcc4125a
Fixed in
  • 7a5ef1fd654d0e90d59aa32c881789c8bcc4125a

Description

This vulnerability involves the validation of deauthentication frame length before accessing the reason field in the mac80211 component of WiFi software. It is identified in Microsoft products versions 3.0 and 4.0. No CVSS score or detailed impact information is provided.

References

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