CVE-2025-38391

System crash via invalid DisplayPort pin indexing

Published Jul 25, 2025 · Updated May 11, 2026

Out-of-bounds read in affected Linux kernel branches allows local users to crash the system through a malformed DisplayPort Alt Mode partner. The pin_assignment_show function treats partner-advertised capability bits beyond DP_PIN_ASSIGN_F as valid array indexes instead of bounding iteration at DP_PIN_ASSIGN_MAX. Triggering the BRK exception requires a noncompliant USB-C DisplayPort Alt Mode partner and local access to read the affected sysfs pin-assignment attribute.

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 read in affected Linux kernel branches allows local users to crash the system through a malformed DisplayPort Alt Mode partner. The pin_assignment_show function treats partner-advertised capability bits beyond DP_PIN_ASSIGN_F as valid array indexes instead of bounding iteration at DP_PIN_ASSIGN_MAX. Triggering the BRK exception requires a noncompliant USB-C DisplayPort Alt Mode partner and local access to read the affected sysfs pin-assignment attribute.

The record

CVE
CVE-2025-38391
Published
Jul 25, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <114a977e0f6bf278e05eade055e13fc271f69cf7
  2. Affected versionversion=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <2f535517b5611b7221ed478527e4b58e29536ddf
  3. Affected versionversion=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <45e9444b3b97eaf51a5024f1fea92f44f39b50c6
  4. Affected versionversion=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <47cb5d26f61d80c805d7de4106451153779297a1
  5. Affected versionversion=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <5581e694d3a1c2f32c5a51d745c55b107644e1f8
  6. Affected versionversion=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <621d5a3ef0231ab242f2d31eecec40c38ca609c5
  7. Affected versionversion=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <af4db5a35a4ef7a68046883bfd12468007db38f1
  8. Affected versionversion=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <c93bc959788ed9a1af7df57cb539837bdf790cee
  9. Affected versionversion=4.19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <114a977e0f6bf278e05eade055e13fc271f69cf7; version=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <2f535517b5611b7221ed478527e4b58e29536ddf; version=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <45e9444b3b97eaf51a5024f1fea92f44f39b50c6; version=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <47cb5d26f61d80c805d7de4106451153779297a1; version=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <5581e694d3a1c2f32c5a51d745c55b107644e1f8; version=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <621d5a3ef0231ab242f2d31eecec40c38ca609c5; version=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <af4db5a35a4ef7a68046883bfd12468007db38f1; version=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <c93bc959788ed9a1af7df57cb539837bdf790cee; version=4.19

Published CVSS scores

5.5NIST NVDCVSS: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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation

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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