7.1

CVE-2026-74225: U-Boot before 2026.10-rc5 Out-of-Bounds Write via DHCPv6

Awaiting analysis
AliasesUBUNTU-CVE-2026-74225DEBIAN-CVE-2026-74225
Published 29-09-2026Last modified 30-09-2026

Vulnerability summary

CVE-2026-74225 is a high (CVSS 7.1) Out-of-bounds Write vulnerability in u-boot. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 13.2% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.1/10
010
High · v4.0 (CVE.org)
EPSS score
0.23%
0%100%
Low · Change unavailable
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
USN-8930-1USN-8930-2

Timeline

  1. 29-09-2026
    PublishedVulnerability first disclosed.
  2. 30-09-2026
    Last modifiedVulnerability information updated.

Description

U-Boot before 2026.10-rc5 contains out-of-bounds memory access in dhcp6_parse_options() that fails to validate SERVERID and CLIENTID option lengths from DHCPv6 packets. Attackers on the local network can send crafted DHCPv6 ADVERTISE or REPLY packets during netboot to corrupt memory and crash the bootloader.

CVSS metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

13%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

30-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu2 products
  • u-bootAll versions (No fix recorded) | < 2025.10-0ubuntu0.24.04.4 | < 2025.10-0ubuntu6 | < 2025.10-0ubuntu2.2
  • u-boot-nezhaAll versions (No fix recorded)
Debian1 product
  • u-bootAll versions (No fix recorded)
U-boot1 product

3 vendors · 4 products

References

9 links