CVE-2022-28806

SMM code execution via unchecked communication buffer

Published May 4, 2022 · Updated Nov 4, 2025

Memory corruption in Fujitsu LIFEBOOK BIOS firmware allows local users with ring 0 access to execute arbitrary code in SMM. The FjGabiFlashCoreAbstractionSmm SWSMI handler writes fixed values through an insufficiently validated CommBuffer that can point into SMRAM. Exploitation requires existing privileged local code execution and permits persistent firmware modification beyond operating-system control.

CVSS severity7.8
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Fujitsu LIFEBOOK BIOS firmware allows local users with ring 0 access to execute arbitrary code in SMM. The FjGabiFlashCoreAbstractionSmm SWSMI handler writes fixed values through an insufficiently validated CommBuffer that can point into SMRAM. Exploitation requires existing privileged local code execution and permits persistent firmware modification beyond operating-system control.

The record

CVE
CVE-2022-28806
Published
May 4, 2022
Updated
Nov 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. May 4, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 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?

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

7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.2BinarlyCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
7.2NVDAV:L/AC:L/Au:N/C:C/I:C/A:C

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

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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