CVE-2026-6485

UEFI BIOS embedded Shell can be used to bypass Secure Boot

Published Sep 9, 2026 CVSS 3.1 · 8.2 High EPSS < 1% KEV · Not listed
Description
UEFI BIOS embedded Shell could be used to bypass Secure Boot via shell commands or startup scripts.

Remediation

Vendor Solution

Kernel 5.3: Version 05.3A.25 Kernel 5.4: Version 05.48.25 Kernel 5.5: Version 05.56.25 Kernel 5.6: Version 05.63.25

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Insyde Software
Insyde Software insydeh2o
Vendors & Products Insyde Software
Insyde Software insydeh2o
Type Values Removed Values Added
Metrics ssvc

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

Type Values Removed Values Added
Description UEFI BIOS embedded Shell could be used to bypass Secure Boot via shell commands or startup scripts.
Title UEFI BIOS embedded Shell can be used to bypass Secure Boot
Weaknesses CWE-489
References
Metrics cvssV3_1

{'score': 8.2, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Insyde
Published
Updated
Sep 10, 2026, 2:30 PM
Reserved
Apr 17, 2026, 6:07 AM
Status
Awaiting Analysis
Published
Sep 9, 2026, 4:19 AM
Modified
Sep 10, 2026, 3:17 PM