CVE-2026-97631
Pre-boot RCE in EDK II PXE driver
- State
- Published
- Severity
- 9.5 Critical
- Published
- Oct 22, 2026
- Updated
- Oct 30, 2026
- Reserved
- Sep 24, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.5 Critical | 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 | TianoCore |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
EDK2TianoCore |
|
References
- https://github.com/tianocore/edk2/security/advisories/GHSA-99cj-7hg9-mp4m
- https://arstechnica.com/security/2026/10/code-execution-flaw-in-uefi-firmware-threatens-most-servers-on-planet-earth/
- https://news.ycombinator.com/item?id=50265393
- https://github.com/microsoft/mu_basecore/pull/1990
- https://github.com/microsoft/mu_basecore/pull/1989
- http://www.openwall.com/lists/oss-security/2026/10/28/4
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