CVE-2023-28746

Local stale register data disclosure via transient execution

Published Mar 14, 2024 · Updated May 12, 2026

Register File Data Sampling in affected Intel Atom processors allows local users to infer stale register data through transient execution. Transient instructions sample values left by prior floating-point, vector, or integer-register operations on the same logical processor, crossing security domains. Locally executable malicious software is required; exposed values can originate from applications, the OS, firmware, hypervisors, or guests, but specific data cannot be selected.

CVSS severity6.5
Medium
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Register File Data Sampling in affected Intel Atom processors allows local users to infer stale register data through transient execution. Transient instructions sample values left by prior floating-point, vector, or integer-register operations on the same logical processor, crossing security domains. Locally executable malicious software is required; exposed values can originate from applications, the OS, firmware, hypervisors, or guests, but specific data cannot be selected.

The record

CVE
CVE-2023-28746
Published
Mar 14, 2024
Updated
May 12, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-1342
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 14, 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 <*
Topcon Positioning Systems, Inc. · Intel Atom Processorsversion=See references

Published CVSS scores

6.5Intel CorporationCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-1342Information Exposure through Microarchitectural State after Transient Execution

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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