Description
A flaw was found in New Horizon Datasys bootloaders before 2022-06-01. An attacker may use this bootloader to bypass or tamper with Secure Boot protections. In order to load and execute arbitrary code in the pre-boot stage, an attacker simply needs to replace the existing signed bootloader currently in use with this bootloader. Access to the EFI System Partition is required for booting using external media.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | fwupd +2 | 1.8.10-2.el9 | RHSA-2023:2487 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | fwupd +2 | 1.8.10-2.el9.alma | ALSA-2023:2487 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | fwupd +2 | 1.8.10-2.0.1.el9 | ELSA-2023-2487 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
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TheMalwareGuardian/CVE-2022-34302 ★ 0 · Sep 7, 2026
CVE-2022-34302 - Secure Boot bypass via New Horizon Datasys signed bootloader (shdloader.efi) - BYOVUA technique exploiting built-in custom PE/COFF loader to load unsigned UEFI applications without s…
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 5
- ALSA-2023:2487 Moderate: fwupd security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2023-1185 Red Hat Enterprise Linux: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 3, 2026
- RHSA-2023:2487 Red Hat Security Advisory: fwupd security and bug fix update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- WID-SEC-2023-2907 Intel NUC Firmware: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 14, 2023
- ELSA-2023-2487 Moderate: fwupd security and bug fix update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 15, 2023