CVE-2026-97631
Pre-boot RCE in EDK II PXE driver
- Published
- Oct 22, 2026
- Updated
- Oct 30, 2026
- Assigning CNA
- TianoCore
- Evidence observed
- Nov 4, 2026
Primary CVSS
nvd · CVSS 4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XLow · next 30 days
- Percentile
- 50.6%
- Model date
- Nov 4, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
- BootjackExploit
Exploit tooling for the EDK II UEFI PXE ICMP error overflow (CVE-2026-97631): crafts spoofed ICMP packets, plants a counterfeit EFI_EVENT, and dumps DXE memory over UART.
Headless QEMU/OVMF harness that drives a PXE boot and fires oversized ICMP errors to reproduce the EDK II PxeBcSupport buffer overflow (CVE-2026-97631) in a local lab.
Educational lab that builds pinned EDK II/OVMF firmware, boots a UEFI VM in QEMU, and runs Python PoC scripts for a PXE network-boot DoS and memory-corruption vulnerability.
Responsible use
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