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.

Analysis

No analysis available yet

Remediation

No remediation available yet

Tracking

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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
  • CWE-124

    Buffer Underwrite ('Buffer Underflow')

  • CWE-787

    Out-of-bounds Write

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