CVE-2026-80615

Kernel warning via fortified tunnel metadata copy

Published Aug 28, 2026 · Updated Aug 28, 2026

Fortify size miscalculation in Linux 7.0 triggers a kernel warning when Geneve transmits tunnel metadata containing options. In tun_dst_unclone, fortified memcpy measures only the 96-byte tun_info member while copying 104 bytes that include valid flexible-array storage. The allocation is large enough, so no real overwrite occurs; the warning requires a Clang build with source fortification.

CVSS severityUnavailable
Unscored
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Fortify size miscalculation in Linux 7.0 triggers a kernel warning when Geneve transmits tunnel metadata containing options. In tun_dst_unclone, fortified memcpy measures only the 96-byte tun_info member while copying 104 bytes that include valid flexible-array storage. The allocation is large enough, so no real overwrite occurs; the warning requires a Clang build with source fortification.

The record

CVE
CVE-2026-80615
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 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=69050f8d6d075dc01af7a5f2f550a8067510366f <4c6d43db2a4d2cef3921e885cf34798f790d34ea
  2. Affected versionversion=69050f8d6d075dc01af7a5f2f550a8067510366f <7ce31739fe88a558370135db95bbeec1e7ddfc29
  3. Affected versionversion=7.0

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=69050f8d6d075dc01af7a5f2f550a8067510366f <4c6d43db2a4d2cef3921e885cf34798f790d34ea; version=69050f8d6d075dc01af7a5f2f550a8067510366f <7ce31739fe88a558370135db95bbeec1e7ddfc29; version=7.0

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
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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