CVE-2026-80925Public exploit

Kernel crash via VLAN headroom race

Published Sep 9, 2026 · Updated Sep 9, 2026

Denial of service in Linux 2.6.12 through 7.2.2 allows local users to crash the kernel by toggling hardware VLAN TX offload. The vlan_transfer_features() function changes vlandev->hard_header_len while lockless transmit paths read it, causing stale headroom sizing and an skb underflow. Triggering the panic requires network-administration privileges, an active VLAN device carrying traffic, and a race with hardware VLAN TX-offload changes.

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

What happened

Denial of service in Linux 2.6.12 through 7.2.2 allows local users to crash the kernel by toggling hardware VLAN TX offload. The vlan_transfer_features() function changes vlandev->hard_header_len while lockless transmit paths read it, causing stale headroom sizing and an skb underflow. Triggering the panic requires network-administration privileges, an active VLAN device carrying traffic, and a race with hardware VLAN TX-offload changes.

The record

CVE
CVE-2026-80925
Published
Sep 9, 2026
Updated
Sep 9, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 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?

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  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <447cbe95ebb95392b5d8f6a01c0556826919ce23
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a29f3b884ba50217e6f50414f568073221e2bb07
  3. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <447cbe95ebb95392b5d8f6a01c0556826919ce23; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a29f3b884ba50217e6f50414f568073221e2bb07; version=2.6.12

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

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

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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