CVE-2025-39760

Information disclosure and crash via descriptor length check

Published Sep 11, 2025 · Updated Jun 11, 2026

Out-of-bounds read in Linux, including SIMATIC CN 4100 before V5.0, allows local users to interrupt service during USB parsing. The usb_parse_ss_endpoint_companion() function reads a descriptor type before confirming that the buffer is long enough to contain that field. Reachability requires parsing a malformed SuperSpeed endpoint companion descriptor; NVD includes kernel-memory disclosure, while Siemens reports availability-only appliance impact.

CVSS severity7.1
High
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 Linux, including SIMATIC CN 4100 before V5.0, allows local users to interrupt service during USB parsing. The usb_parse_ss_endpoint_companion() function reads a descriptor type before confirming that the buffer is long enough to contain that field. Reachability requires parsing a malformed SuperSpeed endpoint companion descriptor; NVD includes kernel-memory disclosure, while Siemens reports availability-only appliance impact.

The record

CVE
CVE-2025-39760
Published
Sep 11, 2025
Updated
Jun 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-20, CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 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=2.6.35
  2. Affected versionversion=842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 <058ad2b722812708fe90567875704ae36563e33b
  3. Affected versionversion=842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 <4fe6f472f0beef4281e6f03bc38a910a33be663f
  4. Affected versionversion=842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 <5badd56c711e2c8371d1670f9bd486697575423c
  5. Affected versionversion=842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 <5c3097ede7835d3caf6543eb70ff689af4550cd2
  6. Affected versionversion=842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 <9512510cee7d1becdb0e9413fdd3ab783e4e30ee
  7. Affected versionversion=842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 <9843bcb187cb933861f7805022e6873905f669e4
  8. Affected versionversion=842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 <b10e0f868067c6f25bbfabdcf3e1e6432c24ca55
  9. Affected versionversion=842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 <cf16f408364efd8a68f39011a3b073c83a03612d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.35; version=842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 <058ad2b722812708fe90567875704ae36563e33b; version=842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 <4fe6f472f0beef4281e6f03bc38a910a33be663f; version=842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 <5badd56c711e2c8371d1670f9bd486697575423c; version=842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 <5c3097ede7835d3caf6543eb70ff689af4550cd2; version=842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 <9512510cee7d1becdb0e9413fdd3ab783e4e30ee; version=842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 <9843bcb187cb933861f7805022e6873905f669e4; version=842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 <b10e0f868067c6f25bbfabdcf3e1e6432c24ca55; version=842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 <cf16f408364efd8a68f39011a3b073c83a03612d
Siemens · SIMATIC CN 4100version=0 <V5.0

Published CVSS scores

5.5Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-125Out-of-bounds Read

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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