CVE-2025-38083

Service interruption via PRIO queue-length underflow

Published Jun 20, 2025 · Updated Aug 5, 2026

Race condition in Linux kernel PRIO scheduling from 5.0, including Siemens MFP firmware V3.1.5, allows local users to interrupt service. In prio_tune(), qdisc_tree_flush_backlog() releases the root lock before qdisc_put(), allowing an SFQ timer rehash to reduce backlog while packets remain queued. Exploitation requires local low-privilege access, a PRIO qdisc with an SFQ child, and winning the timer race; the bounded impact is service interruption.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux kernel PRIO scheduling from 5.0, including Siemens MFP firmware V3.1.5, allows local users to interrupt service. In prio_tune(), qdisc_tree_flush_backlog() releases the root lock before qdisc_put(), allowing an SFQ timer rehash to reduce backlog while packets remain queued. Exploitation requires local low-privilege access, a PRIO qdisc with an SFQ child, and winning the timer race; the bounded impact is service interruption.

The record

CVE
CVE-2025-38083
Published
Jun 20, 2025
Updated
Aug 5, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-362, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 20, 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=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=5.0; version=7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 <20f68e6a9e41693cb0e55e5b9ebbcb40983a4b8f; version=7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 <3aaa7c01cf19d9b9bb64b88b65c3a6fd05da2eb4; version=7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 <4483d8b9127591c60c4eb789d6cab953bc4522a9; version=7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 <46c15c9d0f65c9ba857d63f53264f4b17e8a715f; version=7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 <53d11560e957d53ee87a0653d258038ce12361b7; version=7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 <93f9eeb678d4c9c1abf720b3615fa8299a490845; version=7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 <d35acc1be3480505b5931f17e4ea9b7617fea4d3; version=7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 <e3f6745006dc9423d2b065b90f191cfa11b1b584
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

7.8Linux CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.7Siemens ProductCERTCVSS:3.1/AV:L/AC:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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