CVE-2025-40250

Local service crash via premature IRQ-map cleanup

Published Dec 4, 2025 · Updated Aug 5, 2026

Denial of service in Linux kernel starting in 6.4 and RUGGEDCOM RST2428P before V4.0 allows local users to trigger a kernel panic. The mlx5_irq_alloc() failure path frees the entire CPU reverse map instead of only the newly added IRQ mapping, leaving concurrent users with stale mappings. Exploitation requires local access to an mlx5-equipped system, exhausted IRQ vectors, and both fwctl and RDS enabled; the bounded result is service interruption.

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

Denial of service in Linux kernel starting in 6.4 and RUGGEDCOM RST2428P before V4.0 allows local users to trigger a kernel panic. The mlx5_irq_alloc() failure path frees the entire CPU reverse map instead of only the newly added IRQ mapping, leaving concurrent users with stale mappings. Exploitation requires local access to an mlx5-equipped system, exhausted IRQ vectors, and both fwctl and RDS enabled; the bounded result is service interruption.

The record

CVE
CVE-2025-40250
Published
Dec 4, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-20, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 4, 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=3354822cde5a9f72aa725b3c619188b149a71a33 <4d6b4bea8b80bfa13c903ba547538249e7c5e977
  2. Affected versionversion=3354822cde5a9f72aa725b3c619188b149a71a33 <69e043bce09c9a77e5f55b9ac7505874a2a1a9f0
  3. Affected versionversion=3354822cde5a9f72aa725b3c619188b149a71a33 <6ebd02cf2dde11b86f89ea4c9f55179eab30d4ee
  4. Affected versionversion=3354822cde5a9f72aa725b3c619188b149a71a33 <d47515af6cccd7484d8b0870376858c9848a18ec
  5. Affected versionversion=6.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3354822cde5a9f72aa725b3c619188b149a71a33 <4d6b4bea8b80bfa13c903ba547538249e7c5e977; version=3354822cde5a9f72aa725b3c619188b149a71a33 <69e043bce09c9a77e5f55b9ac7505874a2a1a9f0; version=3354822cde5a9f72aa725b3c619188b149a71a33 <6ebd02cf2dde11b86f89ea4c9f55179eab30d4ee; version=3354822cde5a9f72aa725b3c619188b149a71a33 <d47515af6cccd7484d8b0870376858c9848a18ec; version=6.4
Siemens · RUGGEDCOM RST2428Pversion=0 <V4.0

Published CVSS scores

5.5Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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-20Improper Input Validation
T1499Endpoint Denial of Service

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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