CVE-2026-97631
CriticalCVSS 9.5Summary
EDK2 contains a vulnerability in BIOS where a user may cause an out-of-bounds write, classic buffer overflow, and incorrect calculation of buffer size via remote access. Successful exploitation can lead to arbitrary code execution. It could also impact confidentiality, integrity, and availability.
Risk Assessment
A BIOS firmware flaw may allow a remote attacker to execute arbitrary code at the firmware level, which is hard to detect and remove. This can threaten the confidentiality, integrity, and availability of systems.
Recommendation
Update EDK2/BIOS firmware to a vendor-patched version. Restrict remote access to firmware management interfaces and monitor firmware integrity.
Other vulnerabilities in EDK2
See all- CVE-2025-2296High
EDK2 contains a vulnerability in BIOS where an attacker with local access may cause 'Improper Input Validation'. Successful exploitation could alter control flow unexpectedly, potentially allowing arbitrary command execution and impacting Confidentiality, Integrity, and Availability.
- CVE-2024-38798Medium
EDK2 contains a vulnerability in BIOS where an attacker may cause 'Exposure of Sensitive Information to an Unauthorized Actor' by local access. Successful exploitation may lead to information disclosure or privilege escalation and impact confidentiality.
- CVE-2025-2486High
The Ubuntu edk2 UEFI firmware packages accidentally allowed the UEFI Shell to be accessed in Secure Boot environments, possibly allowing bypass of Secure Boot constraints. Versions 2024.05-2ubuntu0.3 and 2024.02-2ubuntu0.3 disable the Shell; some previous versions inserted a secure-boot-based decision to continue running inside the Shell itself, which is believed to be sufficient to enforce Secure Boot restrictions. This is an additional repair on top of the incomplete fix for CVE-2023-48733.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS