Barebox up to 2026.04.0 EFI PE Loader efi/loader/pe.c VirtualAddress/size integer overflow

Summaryinfo

A vulnerability marked as problematic has been reported in Barebox up to 2026.04.0. This affects an unknown part of the file efi/loader/pe.c of the component EFI PE Loader. Performing a manipulation of the argument VirtualAddress/size results in integer overflow. This vulnerability was named CVE-2026-34963. The attack needs to be approached locally. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Barebox up to 2026.04.0. This affects an unknown code of the file efi/loader/pe.c of the component EFI PE Loader. The manipulation of the argument VirtualAddress/size with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was presented by Kazuma Matsumoto. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-34963 since 03/31/2026. The exploitability is told to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available.

Upgrading to version 2026.04.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-29347). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• Barebox

Version

• 2026.04

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion