CVE-2024-44948

Service disruption via unchecked fixed-MTRR access

Published Sep 4, 2024 · Updated May 12, 2026

Improper exceptional-condition handling in Linux allows local users to disrupt service on CPUs lacking fixed-MTRR support. The x86 mtrr_save_state function reads fixed-range MTRR model-specific registers without first checking the capability bit that declares those registers present. A low-privileged local user and an x86 CPU with MTRRs but no fixed-range support are required; the handled general-protection fault emits WARN_ON, and systems configured to panic on warnings panic.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper exceptional-condition handling in Linux allows local users to disrupt service on CPUs lacking fixed-MTRR support. The x86 mtrr_save_state function reads fixed-range MTRR model-specific registers without first checking the capability bit that declares those registers present. A low-privileged local user and an x86 CPU with MTRRs but no fixed-range support are required; the handled general-protection fault emits WARN_ON, and systems configured to panic on warnings panic.

The record

CVE
CVE-2024-44948
Published
Sep 4, 2024
Updated
May 12, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-754, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2024CVE publishedPublication date reported by the CVE source.
  2. May 12, 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=0 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=2.6.22; version=2b1f6278d77c1f2f669346fc2bb48012b5e9495a <06c1de44d378ec5439db17bf476507d68589bfe9; version=2b1f6278d77c1f2f669346fc2bb48012b5e9495a <34f36e6ee5bd7eff8b2adcd9fcaef369f752d82e; version=2b1f6278d77c1f2f669346fc2bb48012b5e9495a <388f1c954019f253a8383f7eb733f38d541e10b6; version=2b1f6278d77c1f2f669346fc2bb48012b5e9495a <450b6b22acdaac67a18eaf5ed498421ffcf10051; version=2b1f6278d77c1f2f669346fc2bb48012b5e9495a <8a90d3fc7c24608548d3a750671f9dac21d1a462; version=2b1f6278d77c1f2f669346fc2bb48012b5e9495a <8aa79dfb216b865e96ff890bc4ea71650f9bc8d7; version=2b1f6278d77c1f2f669346fc2bb48012b5e9495a <919f18f961c03d6694aa726c514184f2311a4614; version=2b1f6278d77c1f2f669346fc2bb48012b5e9495a <ca7d00c5656d1791e28369919e3e10febe9c3b16

Published CVSS scores

5.5Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS: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-754Improper Check for Unusual or Exceptional Conditions
T1499.004Application or System Exploitation

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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