CVE-2025-54505Public exploit

Local data disclosure via stale divider state

Published Apr 27, 2026 · Updated Apr 27, 2026

Transient execution in AMD EPYC 7001 and EPYC Embedded 3000 processors allows local users to disclose floating-point division data. A denormal SSE or AVX division triggers a microcode assist that transiently exposes stale operands from the previous same-type division on that CPU core through a cache covert channel. Unprivileged same-system code is sufficient, including code in another SMT thread; leakage is limited to prior floating-point division operands and can cross guest or kernel contexts.

CVSS severity2.0
Low
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Transient execution in AMD EPYC 7001 and EPYC Embedded 3000 processors allows local users to disclose floating-point division data. A denormal SSE or AVX division triggers a microcode assist that transiently exposes stale operands from the previous same-type division on that CPU core through a cache covert channel. Unprivileged same-system code is sufficient, including code in another SMT thread; leakage is limited to prior floating-point division operands and can cross guest or kernel contexts.

The record

CVE
CVE-2025-54505
Published
Apr 27, 2026
Updated
Apr 27, 2026
Vendor
Advanced Micro Devices, Inc.
Product
AMD EPYC Embedded 3000 Series Processors
Classifications
T1212
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 27, 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?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Advanced Micro Devices, Inc. · AMD EPYC Embedded 3000 Series ProcessorsAffected versions are unavailable in this record.
Advanced Micro Devices, Inc. · AMD EPYC™ 7001 Series ProcessorsAffected versions are unavailable in this record.

Published CVSS scores

2.0Advanced Micro DevicesCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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 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 exploitPublished

Weakness, pattern, technique

T1212Exploitation for Credential Access

Public exploit references

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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