CVE-2021-38578

edk2: integer underflow in SmmEntryPoint function leads to potential SMM privilege escalation

Published Mar 3, 2022 CVSS 3.1 · 7.4 High EPSS 1.0% KEV · Not listed
Description
Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
Debian DLA Debian DLA DLA-4207-1 edk2 security update
EUVD EUVD EUVD-2021-25020 Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize.
Ubuntu USN Ubuntu USN USN-7060-1 EDK II vulnerabilities
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
TianoCore
Published
Updated
Nov 3, 2025, 7:26 PM
Reserved
Aug 11, 2021, 12:00 AM
Status
Modified
Published
Mar 3, 2022, 10:15 PM
Modified
Jun 17, 2026, 4:02 AM
Severity
Moderate
Public date
Mar 3, 2022, 12:00 AM