CVE-2026-20917

Kernel data disclosure via transient incorrect forwarding

Published Aug 11, 2026 · Updated Aug 11, 2026

Information disclosure in affected Intel processors allows local privileged users to expose kernel or hypervisor data through transient execution. Within Ring 0 execution, the processor incorrectly forwards data into transient operations, leaving secret-dependent microarchitectural effects that reveal sensitive information. Exploitation requires privileged system-software access, high attack complexity, no user interaction, and affects subsequent-system confidentiality only.

CVSS severity4.0
Medium
EPSS probability0.11%
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 affected Intel processors allows local privileged users to expose kernel or hypervisor data through transient execution. Within Ring 0 execution, the processor incorrectly forwards data into transient operations, leaving secret-dependent microarchitectural effects that reveal sensitive information. Exploitation requires privileged system-software access, high attack complexity, no user interaction, and affects subsequent-system confidentiality only.

The record

CVE
CVE-2026-20917
Published
Aug 11, 2026
Updated
Aug 11, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-1422
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 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 buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.0Intel CorporationCVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:H/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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1422Exposure of Sensitive Information caused by Incorrect Data Forwarding during 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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