CVE-2025-39709

Kernel crash via premature IRQ registration

Published Sep 5, 2025 · Updated Aug 5, 2026

NULL pointer dereference in the Venus media driver in affected Linux kernels allows local users to crash the system during device probe. The probe path registers its IRQ before hfi_create() initializes the handler, so a spurious interrupt dereferences a NULL handler pointer. Reachability requires the Qualcomm Venus driver and a probe-time interrupt; the condition was observed during system boot on Rb3Gen2 and affects SIMATIC CN 4100 before V5.0.

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

What happened

NULL pointer dereference in the Venus media driver in affected Linux kernels allows local users to crash the system during device probe. The probe path registers its IRQ before hfi_create() initializes the handler, so a spurious interrupt dereferences a NULL handler pointer. Reachability requires the Qualcomm Venus driver and a probe-time interrupt; the condition was observed during system boot on Rb3Gen2 and affects SIMATIC CN 4100 before V5.0.

The record

CVE
CVE-2025-39709
Published
Sep 5, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-20, CWE-476
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 5, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=4.13
  2. Affected versionversion=af2c3834c8ca7cc65d15592ac671933df8848115 <18c2b2bd982b8546312c9a7895515672169f28e0
  3. Affected versionversion=af2c3834c8ca7cc65d15592ac671933df8848115 <3200144a2fa4209dc084a19941b9b203b43580f0
  4. Affected versionversion=af2c3834c8ca7cc65d15592ac671933df8848115 <37cc0ac889b018097c217c5929fd6dc2aed636a1
  5. Affected versionversion=af2c3834c8ca7cc65d15592ac671933df8848115 <639eb587f977c02423f4762467055b23902b4131
  6. Affected versionversion=af2c3834c8ca7cc65d15592ac671933df8848115 <88cf63c2599761c48dec8f618d57dccf8f6f4b53
  7. Affected versionversion=af2c3834c8ca7cc65d15592ac671933df8848115 <9db6a78bc5e418e0064e2248c8f3b9b9e8418646
  8. Affected versionversion=af2c3834c8ca7cc65d15592ac671933df8848115 <e796028b4835af00d9a38ebbb208ec3a6634702a
  9. Affected versionversion=af2c3834c8ca7cc65d15592ac671933df8848115 <f54be97bc69b1096198b6717c150dec69f2a1b4d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.13; version=af2c3834c8ca7cc65d15592ac671933df8848115 <18c2b2bd982b8546312c9a7895515672169f28e0; version=af2c3834c8ca7cc65d15592ac671933df8848115 <3200144a2fa4209dc084a19941b9b203b43580f0; version=af2c3834c8ca7cc65d15592ac671933df8848115 <37cc0ac889b018097c217c5929fd6dc2aed636a1; version=af2c3834c8ca7cc65d15592ac671933df8848115 <639eb587f977c02423f4762467055b23902b4131; version=af2c3834c8ca7cc65d15592ac671933df8848115 <88cf63c2599761c48dec8f618d57dccf8f6f4b53; version=af2c3834c8ca7cc65d15592ac671933df8848115 <9db6a78bc5e418e0064e2248c8f3b9b9e8418646; version=af2c3834c8ca7cc65d15592ac671933df8848115 <e796028b4835af00d9a38ebbb208ec3a6634702a; version=af2c3834c8ca7cc65d15592ac671933df8848115 <f54be97bc69b1096198b6717c150dec69f2a1b4d
Siemens · SIMATIC CN 4100version=0 <V5.0

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Siemens ProductCERTCVSS: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 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-476NULL Pointer Dereference

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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