CVE-2025-70290: u-boot Integer Overflow or Wraparound
Vulnerability summary
CVE-2025-70290 is a critical (CVSS 9.8) Integer Overflow or Wraparound vulnerability in u-boot. EPSS estimates a 0.67% chance of exploitation in the next 30 days, higher than 51.5% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 1 · Related 1Timeline
- 26-08-2026PublishedVulnerability first disclosed.
- 27-08-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.67%
Chance of exploitation in the next 30 days
Percentile
52%
Versus all other CVEs
30-day change
Increase +0.21 pp
From 0.46% on 22-09-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-190Integer Overflow or WraparoundThe 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 occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
- CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.
Affected systems
Ubuntu2 products
- u-boot< 2016.01+dfsg1-2ubuntu5+esm1 | < 2020.10+dfsg-1ubuntu0~18.04.3+esm1 | < 2021.01+dfsg-3ubuntu0~20.04.6+esm1 | < 2022.01+dfsg-2ubuntu2.8 | < 2025.10-0ubuntu0.24.04.3 | < 2025.10-0ubuntu5 | < 2025.10-0ubuntu2.1
- u-boot-nezhaAll versions (No fix recorded)
Debian1 product
- u-bootAll versions (No fix recorded)
2 vendors · 3 products
