CVE-2022-21127

Local information disclosure via stale register data

Published Jun 15, 2022 · Updated May 5, 2025

Incomplete cleanup in special-register reads in Intel Processors allows local users to disclose stale data from CPU buffers. The original SRBDS mitigation permits a race in which sideband transactions occur between buffer use and overwriting, leaving RDRAND, RDSEED, or EGETKEY data behind. Ring 3 access is sufficient to sample residual values across hardware threads, exposing data without altering or interrupting the system.

CVSS severity5.5
Medium
EPSS probability5.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incomplete cleanup in special-register reads in Intel Processors allows local users to disclose stale data from CPU buffers. The original SRBDS mitigation permits a race in which sideband transactions occur between buffer use and overwriting, leaving RDRAND, RDSEED, or EGETKEY data behind. Ring 3 access is sufficient to sample residual values across hardware threads, exposing data without altering or interrupting the system.

The record

CVE
CVE-2022-21127
Published
Jun 15, 2022
Updated
May 5, 2025
Vendor
Topcon Positioning Systems, Inc.
Product
Intel Processors
Classifications
CWE-459, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 15, 2022CVE publishedPublication date reported by the CVE source.
  2. May 5, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=See references

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Topcon Positioning Systems, Inc. · Intel Processorsversion=See references

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
5.5Intel CorporationCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/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.

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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-459Incomplete Cleanup
T1005Data from Local System

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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