CVE-2025-38215

Local service crash via failed framebuffer mode allocation

Published Jul 4, 2025 · Updated Jul 14, 2026

Null-pointer dereference in Linux fbdev allows local users to crash the kernel through a framebuffer mode-change ioctl. If fb_add_videomode() cannot allocate a mode, do_register_framebuffer() still registers fb_info without the expected modelist entry, which fb_videomode_to_var() later dereferences. Exploitation requires local low-privileged ioctl access to an fbdev device and interrupts the affected host or an embedded GNU/Linux subsystem.

CVSS severity5.5
Medium
EPSS probability0.15%
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 Linux fbdev allows local users to crash the kernel through a framebuffer mode-change ioctl. If fb_add_videomode() cannot allocate a mode, do_register_framebuffer() still registers fb_info without the expected modelist entry, which fb_videomode_to_var() later dereferences. Exploitation requires local low-privileged ioctl access to an fbdev device and interrupts the affected host or an embedded GNU/Linux subsystem.

The record

CVE
CVE-2025-38215
Published
Jul 4, 2025
Updated
Jul 14, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 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=V3.1.5 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.5 <*
The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0909b2b49c4546a7a08c80f53d93736b63270827; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <17186f1f90d34fa701e4f14e6818305151637b9e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3f2098f4fba7718eb2501207ca6e99d22427f25a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <908c5bb64f9c4319902b8ca1aa3fef8f83302520; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d803c4c2a4ac8ce2be6d899d5c7ab0bf7ec355e9; version=2.6.12
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.5 <*
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.5 <*

Published CVSS scores

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-476NULL Pointer Dereference
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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