CVE-2026-98687Hinoki check available

Heap over-read via unchecked XDomain response length

Published Oct 18, 2026 · Updated Oct 18, 2026

Linux Thunderbolt XDomain discovery allows physically proximate attackers to trigger a 12-byte kernel heap over-read via peer responses. The tb_xdp_properties_request() function trusts a response-header length that makes memcpy() read 192 bytes from a 180-byte data array when the destination permits it. Exposure requires a malicious cable-connected peer; external disclosure and code execution were not demonstrated, and physical peer injection was not tested.

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

Linux Thunderbolt XDomain discovery allows physically proximate attackers to trigger a 12-byte kernel heap over-read via peer responses. The tb_xdp_properties_request() function trusts a response-header length that makes memcpy() read 192 bytes from a 180-byte data array when the destination permits it. Exposure requires a malicious cable-connected peer; external disclosure and code execution were not demonstrated, and physical peer injection was not tested.

The record

CVE
CVE-2026-98687
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
physical
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 18, 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=4.15
  2. Affected versionversion=d1ff70241a275133e1a0258b7c23588b122276c8 <2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa
  3. Affected versionversion=d1ff70241a275133e1a0258b7c23588b122276c8 <737a1d2e9642d5f718bd29aa4a98b9eef3832f0a
  4. Affected versionversion=d1ff70241a275133e1a0258b7c23588b122276c8 <80756e263846ab694984e749e8c626897331438f
  5. Affected versionversion=d1ff70241a275133e1a0258b7c23588b122276c8 <a766a86ff48acee76aeb8e2575771040749e509d

What conditions does exploitation require?

Attack vectorphysical
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.15; version=d1ff70241a275133e1a0258b7c23588b122276c8 <2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa; version=d1ff70241a275133e1a0258b7c23588b122276c8 <737a1d2e9642d5f718bd29aa4a98b9eef3832f0a; version=d1ff70241a275133e1a0258b7c23588b122276c8 <80756e263846ab694984e749e8c626897331438f; version=d1ff70241a275133e1a0258b7c23588b122276c8 <a766a86ff48acee76aeb8e2575771040749e509d

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)
Vectorphysical
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

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