CVE-2026-74585

Kernel crash via unchecked Thunderbolt port index

Published Aug 22, 2026 · Updated Aug 22, 2026

Out-of-bounds access in the Linux Thunderbolt driver allows physically proximate attackers to crash the kernel with a malformed device. tb_drom_parse_entry_port() bounds the DROM header index but uses the device-supplied dual_link_port_nr to index sw->ports[] without checking max_port_number, storing an out-of-bounds tb_port pointer that is later dereferenced. Exploitation requires a malicious or malformed Thunderbolt device to supply the DROM entry, and the documented consequence is a kernel crash rather than data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in the Linux Thunderbolt driver allows physically proximate attackers to crash the kernel with a malformed device. tb_drom_parse_entry_port() bounds the DROM header index but uses the device-supplied dual_link_port_nr to index sw->ports[] without checking max_port_number, storing an out-of-bounds tb_port pointer that is later dereferenced. Exploitation requires a malicious or malformed Thunderbolt device to supply the DROM entry, and the documented consequence is a kernel crash rather than data disclosure or modification.

The record

CVE
CVE-2026-74585
Published
Aug 22, 2026
Updated
Aug 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-823, T1499
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 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=3.17
  2. Affected versionversion=cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 <3d3c212b70633332ab71672aa2bc6af257d2ec83
  3. Affected versionversion=cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 <40d2ffb74094cf36edbe05855566a4c58b6ce808
  4. Affected versionversion=cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 <50f0c8dd8c3390f851cfb97ca13116f9ee6469d1
  5. Affected versionversion=cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 <6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c
  6. Affected versionversion=cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 <b98e1e28bd95b0fa33164eec1e763d26c7058b39
  7. Affected versionversion=cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 <d6764992f17b23d91ff93ce905ab53c2aa7191f0
  8. Affected versionversion=cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 <f28066057134aa9294caa597b670daf505ad9dce
  9. Affected versionversion=cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 <f32c3a9a77cfb50934a60b05d5407649af062535

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.17; version=cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 <3d3c212b70633332ab71672aa2bc6af257d2ec83; version=cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 <40d2ffb74094cf36edbe05855566a4c58b6ce808; version=cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 <50f0c8dd8c3390f851cfb97ca13116f9ee6469d1; version=cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 <6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c; version=cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 <b98e1e28bd95b0fa33164eec1e763d26c7058b39; version=cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 <d6764992f17b23d91ff93ce905ab53c2aa7191f0; version=cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 <f28066057134aa9294caa597b670daf505ad9dce; version=cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 <f32c3a9a77cfb50934a60b05d5407649af062535

Published CVSS scores

4.6Amazon LinuxCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-823Use of Out-of-range Pointer Offset
T1499Endpoint Denial of Service

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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