CVE-2026-74225

high

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.

References

https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-out-of-bounds-write-via-dhcpv6

https://github.com/u-boot/u-boot/commit/20209a62bc8565fc1e040882bc03c71ff0d73076

https://github.com/u-boot/u-boot/blob/v2026.07/net/dhcpv6.c#L304

https://github.com/u-boot/u-boot

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-89436

Details

Source: Mitre, NVD

Published: 2026-09-29

Updated: 2026-09-30

Risk Information

CVSS v2

Base Score: 6.8

Vector: CVSS2#AV:A/AC:L/Au:N/C:N/I:P/A:C

Severity: Medium

CVSS v3

Base Score: 7.1

Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Severity: High

CVSS v4

Base Score: 7.1

Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

Severity: High

EPSS

EPSS: 0.00232