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CVE-2026-80905VulnerabilityPublished Updated

Microsoft · net: tap: fix wrong transport_header when sending VLAN-tagged frame

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-80905· Medium

Not known to be exploited · fixed in f1d297cad5c1eacd9fadfd0346ad97405ffbf97c : update Microsoft when convenient.

Data as of 7 Nov 2026, 12:19 UTC

Severity
Medium

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in f1d297cad5c1eacd9fadfd0346ad97405ffbf97c, cbb35cbe8db268fefe34c23df15348cf99025298, c0376820922d255ae1d103c32345a6ec4c3266f7 +4

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 Sep 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 7 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • >=4.20.1 <4.21
Fixed in
  • f1d297cad5c1eacd9fadfd0346ad97405ffbf97c
  • cbb35cbe8db268fefe34c23df15348cf99025298
  • c0376820922d255ae1d103c32345a6ec4c3266f7
  • a8f49e83e4447b885376e6a937d62df883cc8824
  • 88b79ac89ecc04d7f2613f7e1c0b46f0c4ddb2f3
  • 5ffaa5d7f56ab24a8e23cf131eadfef31a3bbc4b
  • 4.21
LinuxLinuxAffected
  • =5.0
Fixed in–

Description

To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

References

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