What’s Vulnerable › Vulnerabilities
CVE-2026-97631: Pre-boot RCE in EDK II PXE driver
- Severity: critical (CVSS 9.5 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-22 · updated 2026-10-30
- Weakness: CWE-120
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
- TianoCore edk2: through edk2-stable202608
In the news
References
- https://github.com/tianocore/edk2/security/advisories/GHSA-99cj-7hg9-mp4m
- http://www.openwall.com/lists/oss-security/2026/10/28/4
- https://arstechnica.com/security/2026/10/code-execution-flaw-in-uefi-firmware-threatens-most-servers-on-planet-earth/
- https://github.com/microsoft/mu_basecore/pull/1989
- https://github.com/microsoft/mu_basecore/pull/1990
- https://news.ycombinator.com/item?id=50265393
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