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CVE-2022-32476

HIGH
7
CVSS Score
Published: February 15, 2023 at 12:00 AM UTC
Updated: June 17, 2026 at 04:47 AM UTC
1 product affected across 1 vendorInsydeH2O

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Severity
HIGH7
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

Description

An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. DMA attacks on the AhciBusDxe shared buffer used by SMM and non-SMM code could cause TOCTOU race-condition issues that could lead to corruption of SMRAM and escalation of privileges. This attack can be mitigated using IOMMU protection for the ACPI runtime memory used for the command buffer. This attack can be mitigated by copying the firmware block services data to SMRAM before checking it.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

InsydeH2O· Insyde
95%
5.0 ≤ v < 5.2.05.27.275.3 ≤ v < 5.3.05.36.275.4 ≤ v < 5.4.05.44.275.5 ≤ v < 5.5.05.52.27
Affected range stops below 5.2.05.27.27, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.3.05.36.27, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.4.05.44.27, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.5.05.52.27, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: [email protected]
https://www.insyde.com/security-pledge
Vendor Advisory
Source: [email protected]
https://www.insyde.com/security-pledge/SA-2023008

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7HIGHCISA-ADP
Attack Vector
LOCAL
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-367

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