CVE-2026-80905Hinoki check available

Incorrect transport parsing via misplaced network header

Published Sep 4, 2026 · Updated Sep 4, 2026

Incorrect transport-header parsing in affected Linux kernels allows attackers to trigger unspecified impact via VLAN-tagged TAP frames. tap_get_user_xdp advances network_header before probing while skb->protocol still identifies VLAN, causing the flow dissector to treat the inner protocol header as another VLAN header and leave transport_header unset. Reaching the defect requires a VLAN-tagged frame through the TAP XDP transmit path; the Linux CVE notice states no concrete security consequence.

CVSS severityUnavailable
Unscored
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Incorrect transport-header parsing in affected Linux kernels allows attackers to trigger unspecified impact via VLAN-tagged TAP frames. tap_get_user_xdp advances network_header before probing while skb->protocol still identifies VLAN, causing the flow dissector to treat the inner protocol header as another VLAN header and leave transport_header unset. Reaching the defect requires a VLAN-tagged frame through the TAP XDP transmit path; the Linux CVE notice states no concrete security consequence.

The record

CVE
CVE-2026-80905
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3cae5ef1f37a475faf7c40bc6a3c170779f3e0b1
  2. Affected versionversion=4.20.1 <4.21
  3. Affected versionversion=5.0
  4. Affected versionversion=8c76e77f9069f10505c08e02646c3ee11ad79038 <5ffaa5d7f56ab24a8e23cf131eadfef31a3bbc4b
  5. Affected versionversion=8c76e77f9069f10505c08e02646c3ee11ad79038 <88b79ac89ecc04d7f2613f7e1c0b46f0c4ddb2f3
  6. Affected versionversion=8c76e77f9069f10505c08e02646c3ee11ad79038 <cbb35cbe8db268fefe34c23df15348cf99025298

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3cae5ef1f37a475faf7c40bc6a3c170779f3e0b1; version=4.20.1 <4.21; version=5.0; version=8c76e77f9069f10505c08e02646c3ee11ad79038 <5ffaa5d7f56ab24a8e23cf131eadfef31a3bbc4b; version=8c76e77f9069f10505c08e02646c3ee11ad79038 <88b79ac89ecc04d7f2613f7e1c0b46f0c4ddb2f3; version=8c76e77f9069f10505c08e02646c3ee11ad79038 <cbb35cbe8db268fefe34c23df15348cf99025298

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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