CVE-2025-22083

Local kernel compromise via stale vhost-scsi backend pointer

Published Apr 16, 2025 · Updated Sep 8, 2026

Use-after-free in affected Linux and Siemens embedded kernels allows local users to read or write kernel memory or crash the host. A repeated VHOST_SCSI_SET_ENDPOINT call can free the vs_tpg array without replacing the virtqueue backend, leaving SCSI requests to dereference a stale pointer. Exploitation requires access to /dev/vhost-scsi on a configured host, such as a deprivileged QEMU process, and can also wedge target-group removal until reboot.

CVSS severity7.8
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in affected Linux and Siemens embedded kernels allows local users to read or write kernel memory or crash the host. A repeated VHOST_SCSI_SET_ENDPOINT call can free the vs_tpg array without replacing the virtqueue backend, leaving SCSI requests to dereference a stale pointer. Exploitation requires access to /dev/vhost-scsi on a configured host, such as a deprivileged QEMU process, and can also wedge target-group removal until reboot.

The record

CVE
CVE-2025-22083
Published
Apr 16, 2025
Updated
Sep 8, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-416, T1499.004, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 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=V3.1.6 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.6 <*
The Linux Kernel Organization · Linuxversion=3.9; version=4f7f46d32c9875004fae1d57ae3c02cc2e6cd6a3 <2b34bdc42df047794542f3e220fe989124e4499a; version=4f7f46d32c9875004fae1d57ae3c02cc2e6cd6a3 <3a19eb3d9818e28f14c818a18dc913344a52ca92; version=4f7f46d32c9875004fae1d57ae3c02cc2e6cd6a3 <3fd054baf382a426bbf5135ede0fc5673db74d3e; version=4f7f46d32c9875004fae1d57ae3c02cc2e6cd6a3 <451c72f5e7cf5d339a6410a635cee0825687c3dc; version=4f7f46d32c9875004fae1d57ae3c02cc2e6cd6a3 <5dd639a1646ef5fe8f4bf270fad47c5c3755b9b6; version=4f7f46d32c9875004fae1d57ae3c02cc2e6cd6a3 <63b449f73ab0dcc0ba11ceaa4c5c70bc86ccf03c
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.6 <*
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.6 <*

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Application or System Exploitation
T1068Exploitation for Privilege Escalation

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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