CVE-2021-45454

Cross-tenant disclosure via exposed power telemetry

Published Aug 17, 2022 · Updated Aug 4, 2024

Information disclosure in Ampere Altra before SRP 1.08b and Altra Max before SRP 2.05 allows local users to infer tenant secrets via HWmon. The Linux HWmon driver exposes CPU power telemetry to unprivileged software instead of restricting access, enabling power-analysis inference. A multi-tenant Altra-family system with exposed HWmon sensors is required; the reported impact is limited to cross-tenant confidentiality loss.

CVSS severity7.5
High
EPSS probability0.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Ampere Altra before SRP 1.08b and Altra Max before SRP 2.05 allows local users to infer tenant secrets via HWmon. The Linux HWmon driver exposes CPU power telemetry to unprivileged software instead of restricting access, enabling power-analysis inference. A multi-tenant Altra-family system with exposed HWmon sensors is required; the reported impact is limited to cross-tenant confidentiality loss.

The record

CVE
CVE-2021-45454
Published
Aug 17, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 17, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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 buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.3Ampere ComputingCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/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 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

T1005Data from Local System

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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