Vulnerability · Published Aug 26, 2026 · Assigned by mitre
CVE-2025-70290
Critical 9.8
In plain English
A critical-severity out-of-bounds write in the u-boot package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | u-boot | no fix listed | DEBIAN-CVE-2025-70290 |
| Debian:13 | u-boot | no fix listed | DEBIAN-CVE-2025-70290 |
| Debian:14 | u-boot | no fix listed | DEBIAN-CVE-2025-70290 |
| Ubuntu:22.04:LTS | u-boot | 2022.01+dfsg-2ubuntu2.8 | USN-8884-1 |
| Ubuntu:22.04:LTS | u-boot | 2022.01+dfsg-2ubuntu2.8 | UBUNTU-CVE-2025-70290 |
| Ubuntu:24.04:LTS | u-boot | 2025.10-0ubuntu0.24.04.3 | UBUNTU-CVE-2025-70290 |
| Ubuntu:24.04:LTS | u-boot | 2025.10-0ubuntu0.24.04.3 | USN-8884-1 |
| Ubuntu:26.04:LTS | u-boot | 2025.10-0ubuntu2.1 | USN-8884-1 |
| Ubuntu:26.04:LTS | u-boot | 2025.10-0ubuntu2.1 | UBUNTU-CVE-2025-70290 |
| Ubuntu:26.10 | u-boot | 2025.10-0ubuntu5 | UBUNTU-CVE-2025-70290 |
| Ubuntu:22.04:LTS | u-boot-nezha | no fix listed | UBUNTU-CVE-2025-70290 |
| Ubuntu:24.04:LTS | u-boot-nezha | no fix listed | UBUNTU-CVE-2025-70290 |
Affected products (as reported)
Weakness: CWE-787, CWE-190 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H