What is CVE-2026-74225?

CVE-2026-74225 is a high-severity vulnerability in U-Boot, classified under Out-of-bounds Write. CVSS score: 7.1/10. Published 2026-09-29.

How severe is CVE-2026-74225?

High severity. CVSS v3 base score is 7.1 out of 10.

Buffer overflow in U-Boot

CVE-2026-74225

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.

Vulnerability class: Buffer Overflow

Published 2026-09-29 · last modified 2026-09-30.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

U-Boot

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/u-boot/u-boot/commit/20209a62bc8565fc1e040882bc03c71ff0d73076 (patch)
github.com/u-boot/u-boot/blob/v2026.07/net/dhcpv6.c (technical-description)
github.com/u-boot/u-boot (product)
VulnCheck Advisory: U-Boot before 2026.10-rc5 Out-of-Bounds Write via DHCPv6 (third-party-advisory)

Frequently asked questions

What is CVE-2026-74225?: CVE-2026-74225 is a high-severity vulnerability in U-Boot, classified under Out-of-bounds Write. CVSS score: 7.1/10. Published 2026-09-29.
How severe is CVE-2026-74225?: High severity. CVSS v3 base score is 7.1 out of 10.