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CVE-2022-33985

HIGH
7
CVSS Score
Published: November 14, 2022 at 12:00 AM UTC
Updated: June 17, 2026 at 04:49 AM UTC
1 product affected across 1 vendorKernel

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Severity
HIGH7
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

Description

DMA transactions which are targeted at input buffers used for the NvmExpressDxe software SMI handler could cause SMRAM corruption through a TOCTOU attack. DMA transactions which are targeted at input buffers used for the software SMI handler used by the NvmExpressDxe driver could cause SMRAM corruption through a TOCTOU attack. This issue was discovered by Insyde engineering based on the general description provided by Intel's iSTARE group. This issue was fixed in kernel 5.2: 05.27.25, kernel 5.3: 05.36.25, kernel 5.4: 05.44.25, kernel 5.5: 05.52.25 https://www.insyde.com/security-pledge/SA-2022055

Affected

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

Kernel· Insyde
95%
5.2 ≤ v < 5.2.05.27.255.3 ≤ v < 5.3.05.36.255.4 ≤ v < 5.4.05.44.255.5 ≤ v < 5.5.05.52.25
Affected range stops below 5.2.05.27.25, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.3.05.36.25, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.4.05.44.25, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.5.05.52.25, 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-2022055

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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