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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
TianoCore EDK2
Default version status: unaffected
0 to ≤ edk2-stable202608affected
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 ↗