CVE-2026-97631

Pre-boot RCE in EDK II PXE driver

Published Oct 22, 2026 CVSS 4.0 · 9.5 Critical EPSS < 1% KEV · Not listed
Description
EDK2 contains a vulnerability in BIOS where a user may cause “Out-of-bounds
Write”, Classic
Buffer Overflow, and “Incorrect Calculation of Buffer Size” by remote access. Successful exploitation of this vulnerability
can lead to arbitrary
code execution. It could also impact
Confidentiality,
Integrity,
and Availability.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

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

Type Values Removed Values Added
References
Metrics threat_severity

None

cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Critical

Type Values Removed Values Added
First Time appeared Tianocore
Tianocore edk2
Vendors & Products Tianocore
Tianocore edk2
Type Values Removed Values Added
Description EDK2 contains a vulnerability in BIOS where a user may cause “Out-of-bounds Write”, Classic Buffer Overflow, and “Incorrect Calculation of Buffer Size” by remote access. Successful exploitation of this vulnerability can lead to arbitrary code execution. It could also impact Confidentiality, Integrity, and Availability.
Title Pre-boot RCE in EDK II PXE driver
Weaknesses CWE-120
CWE-131
CWE-787
References
Metrics cvssV4_0

{'score': 9.5, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
TianoCore
Published
Updated
Oct 30, 2026, 7:34 PM
Reserved
Sep 24, 2026, 4:56 PM
Status
Deferred
Published
Oct 22, 2026, 5:17 PM
Modified
Oct 30, 2026, 8:17 PM
Severity
Critical
Public date
Oct 22, 2026, 4:32 PM