CVE-2022-46897

Memory disclosure via unchecked CapsuleIFWUSmm return value

Published Apr 22, 2024 · Updated Aug 3, 2024

Unchecked return value in InsydeH2O kernel 5.0 through 5.5 allows local users with high privileges to disclose memory contents. The CapsuleIFWUSmm driver continues without handling an unexpected method or function result, causing a memory leak. Exploitation requires local, high-privilege access and high-complexity conditions; the reported consequence is confidentiality loss without integrity or availability impact.

CVSS severity5.3
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unchecked return value in InsydeH2O kernel 5.0 through 5.5 allows local users with high privileges to disclose memory contents. The CapsuleIFWUSmm driver continues without handling an unexpected method or function result, causing a memory leak. Exploitation requires local, high-privilege access and high-complexity conditions; the reported consequence is confidentiality loss without integrity or availability impact.

The record

CVE
CVE-2022-46897
Published
Apr 22, 2024
Updated
Aug 3, 2024
Vendor
Insyde Software
Product
InsydeH2O UEFI BIOS
Classifications
CWE-252
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Apr 22, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Insyde Software · InsydeH2O UEFI BIOSversion=5.0

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:L/AC:H/PR:H/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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-252Unchecked Return Value

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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