Vulnerability Description
barebox version prior to 2026.04.0 contains multiple memory-safety vulnerabilities in the EFI PE loader in efi/loader/pe.c where integer overflow in virtual image size computation using 32-bit arithmetic on section VirtualAddress and size values allows undersized heap allocation, and PE section loading logic fails to validate that PointerToRawData plus copied size remains within the PE file buffer. An attacker can supply a malicious EFI PE binary via TFTP, USB, SD card, or network boot to trigger heap buffer overflow or out-of-bounds read from heap memory, potentially achieving code execution in bootloader context.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Pengutronix | Barebox | < 2026.04.0 |
Related Weaknesses (CWE)
References
- https://github.com/barebox/bareboxProduct
- https://github.com/barebox/barebox/releases/tag/v2026.04.0Release Notes
- https://www.vulncheck.com/advisories/barebox-efi-pe-loader-memory-safety-vulneraThird Party Advisory
FAQ
What is CVE-2026-34963?
CVE-2026-34963 is a vulnerability with a CVSS score of 8.4 (HIGH). barebox version prior to 2026.04.0 contains multiple memory-safety vulnerabilities in the EFI PE loader in efi/loader/pe.c where integer overflow in virtual image size computation using 32-bit arithme...
How severe is CVE-2026-34963?
CVE-2026-34963 has been rated HIGH with a CVSS base score of 8.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34963?
Check the references section above for vendor advisories and patch information. Affected products include: Pengutronix Barebox.