CVE-2026-97965Hinoki check available

Kernel stack disclosure via uninitialized VXLAN metadata

Published Sep 25, 2026 · Updated Sep 25, 2026

Information disclosure in the Linux kernel's VXLAN transmit path allows attackers to leak kernel stack data in transmitted policy IDs. vxlan_xmit_one leaves stack-local _md uninitialized when external tunnel information omits the VXLAN option flag, and vxlan_build_gbp_hdr reads its gbp field. The leak requires metadata collection and GBP on the VXLAN device plus traffic carrying external tunnel information without that flag.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

Information disclosure in the Linux kernel's VXLAN transmit path allows attackers to leak kernel stack data in transmitted policy IDs. vxlan_xmit_one leaves stack-local _md uninitialized when external tunnel information omits the VXLAN option flag, and vxlan_build_gbp_hdr reads its gbp field. The leak requires metadata collection and GBP on the VXLAN device plus traffic carrying external tunnel information without that flag.

The record

CVE
CVE-2026-97965
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1040
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.3
  2. Affected versionversion=ee122c79d4227f6ec642157834b6a90fcffa4382 <081f22177d9d12b1e381b787f203cd5f47508187
  3. Affected versionversion=ee122c79d4227f6ec642157834b6a90fcffa4382 <0d13b5a413bffc8718b3821b78537ccc6596c233
  4. Affected versionversion=ee122c79d4227f6ec642157834b6a90fcffa4382 <be83178bfc44588f6e3adb827ed874c683193466
  5. Affected versionversion=ee122c79d4227f6ec642157834b6a90fcffa4382 <bfb74c48ac2d31476d5e09cf9658844508d2608a

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=4.3; version=ee122c79d4227f6ec642157834b6a90fcffa4382 <081f22177d9d12b1e381b787f203cd5f47508187; version=ee122c79d4227f6ec642157834b6a90fcffa4382 <0d13b5a413bffc8718b3821b78537ccc6596c233; version=ee122c79d4227f6ec642157834b6a90fcffa4382 <be83178bfc44588f6e3adb827ed874c683193466; version=ee122c79d4227f6ec642157834b6a90fcffa4382 <bfb74c48ac2d31476d5e09cf9658844508d2608a

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1040Network Sniffing

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

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Get started