CVE-2026-97631: CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in TianoCore EDK2
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.
CVSS v4.0
Score 9.5critical
Affected software
TianoCore
EDK2
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-97631 is a classic buffer overflow vulnerability in the TianoCore EDK2 BIOS. It involves improper handling of buffer sizes during memory copy operations, resulting in out-of-bounds writes. Exploitation requires remote access and can lead to arbitrary code execution, affecting system confidentiality, integrity, and availability. The CVSS 4.0 base score is 9.5, indicating critical severity with network attack vector, low attack complexity, no privileges or user interaction required, and high impact on all security properties.
Potential Impact
Successful exploitation can lead to arbitrary code execution on the affected BIOS, compromising system confidentiality, integrity, and availability. This could allow attackers to execute malicious code at a low level, potentially controlling the system firmware and bypassing security controls.
Mitigation Recommendations
No patch or official fix information is currently available. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is released, limit remote access to affected systems and monitor for suspicious activity related to BIOS interactions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- TianoCore
- Date Reserved
- 2026-09-24T16:56:45.359Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ada3dcf4d27ba8daa67fdb9
Added to database: 10/22/2026, 16:46:07 UTC
Last enriched: 10/22/2026, 17:00:18 UTC
Last updated: 10/22/2026, 17:18:01 UTC
Views: 5
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