Description
An issue was discovered in Denx U-Boot before 2026.04. An integer overflow vulnerability in the ZFS filesystem support can be triggered by malformed on-disk metadata. The issue may result in incorrect memory allocation followed by out-of-bounds memory access, potentially leading to a crash or arbitrary code execution during the boot process.
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.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | u-boot | No fix yet | — |
| Debian 13 | u-boot | No fix yet | — |
| Debian 12 | u-boot | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | u-boot | 2025.10-0ubuntu5 | — |
| Ubuntu 26.04 LTS | u-boot | 2025.10-0ubuntu2.1 | USN-8884-1 |
| Ubuntu 24.04 LTS | u-boot | 2025.10-0ubuntu0.24.04.3 | USN-8884-1 |
| Ubuntu 24.04 LTS | u-boot-nezha | No fix yet | — |
| Ubuntu 22.04 LTS | u-boot | 2022.01+dfsg-2ubuntu2.8 | USN-8884-1 |
| Ubuntu 22.04 LTS | u-boot-nezha | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | u-boot | 2021.01+dfsg-3ubuntu0~20.04.6+esm1 | USN-8884-1 |
| Ubuntu Pro 18.04 LTS | u-boot | 2020.10+dfsg-1ubuntu0~18.04.3+esm1 | USN-8884-1 |
| Ubuntu Pro 16.04 LTS | u-boot | 2016.01+dfsg1-2ubuntu5+esm1 | USN-8884-1 |
Advisories 2
- USN-8884-1 u-boot vulnerabilities Ubuntu Security Notices (USN) · Oct 7, 2026
- WID-SEC-2026-3052 DENX U-Boot: Mehrere Schwachstellen ermöglichen Codeausführung und DoS BSI CERT-Bund (WID) · Oct 6, 2026