CVE-2025-38649

System crash via cyclic Coresight topology

Published Aug 22, 2025 · Updated May 11, 2026

Denial of service in Linux kernel 6.14 allows local users to crash QCS615 systems by enabling only a Coresight source device. The QCS615 device-tree topology connects Coresight components in a cycle, causing coresight_find_activated_sysfs_sink() to recurse until kernel stack overflow. Reaching the trigger requires root access to the sysfs enable_source attribute, and the bounded consequence is a system crash.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux kernel 6.14 allows local users to crash QCS615 systems by enabling only a Coresight source device. The QCS615 device-tree topology connects Coresight components in a cycle, causing coresight_find_activated_sysfs_sink() to recurse until kernel stack overflow. Reaching the trigger requires root access to the sysfs enable_source attribute, and the bounded consequence is a system crash.

The record

CVE
CVE-2025-38649
Published
Aug 22, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-835, T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 22, 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=6.14
  2. Affected versionversion=bf469630552a3950d0370dd5fd1f9bf0145d09d5 <a9aaadcb0a6ce0c19616c46525112bc947c6f2b1
  3. Affected versionversion=bf469630552a3950d0370dd5fd1f9bf0145d09d5 <bd4f35786d5f0798cc1f8c187a81a7c998e6c58f
  4. Affected versionversion=bf469630552a3950d0370dd5fd1f9bf0145d09d5 <fbe5be7893b8c7f58c999a26839cd30bc07654c6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=6.14; version=bf469630552a3950d0370dd5fd1f9bf0145d09d5 <a9aaadcb0a6ce0c19616c46525112bc947c6f2b1; version=bf469630552a3950d0370dd5fd1f9bf0145d09d5 <bd4f35786d5f0798cc1f8c187a81a7c998e6c58f; version=bf469630552a3950d0370dd5fd1f9bf0145d09d5 <fbe5be7893b8c7f58c999a26839cd30bc07654c6

Published CVSS scores

5.5UbuntuCVSS: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)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
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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